Merge branch 'feature/fix-chat-immediate-todo-reorder' - chat immediate display + todo reorder

チャット送信の即時表示とKanbanのDnD並べ替えを修正。

- chat: 送信成功時に返却メッセージを楽観的にローカルへ先頭追加(SSE到着前でも即表示、idで重複排除)。setSending(false) をレスポンス処理後に移動し二重送信窓を縮小。
- todo: TodoService.reorderItems(projectId, columnId, itemIds[]) を追加(1トランザクションでカラム内を再採番、メンバーシップ+同プロジェクト検証、活動ログ/SSEは1件)。POST /todos/items/reorder を追加。
- KanbanBoard: カード単位のドロップターゲット(ポインタYで前/後挿入)+カラム空き領域は末尾追加。楽観的にorderIndex/columnIdを更新しrenderをorderIndexでソート(即時反映)、失敗時はエラー表示+再取得で巻き戻し。ドラッグ直後の誤クリック(ダイアログ誘起)をdragEndタイムスタンプで抑制。空の並べ替えはSSE/ログを出さない。

.gitignore

@@ -47,6 +47,9 @@ Thumbs.db
 coverage/
 .nyc_output/
 
+# Steering files (task management - temporary)
+.steering/*
+!.steering/.gitkeep
 
 # Lock files (keep package-lock.json for consistency)
 # yarn.lock

.steering/20260624-m1-m4-foundation/design.md

@@ -1,189 +0,0 @@
-# Design Document
-
-## Architecture Overview
-
-Layered architecture (UI → Service → Repository → Data) per `docs/architecture.md`. Next.js 15 App Router with Node.js Runtime only (no Edge Runtime). SQLite via better-sqlite3 accessed exclusively through a custom SQL wrapper. No Prisma.
-
-```
-app/ (UI: Route Handlers / Server Components / SSE)
-  ↓
-services/ (business logic, permission checks, transactions)
-  ↓
-repositories/ (SQL, parameter binding, logical-delete filter)
-  ↓
-lib/db/ (SQLite connection, SQL wrapper, Migration)
-```
-
-## Component Design
-
-### 1. SQL Wrapper: `lib/db/sqlite.ts`
-
-**Responsibilities**:
-- SQLite connection management (singleton getDb(), WAL, foreign_keys ON)
-- query<T> (multi-row), get<T> (single-row), execute (insert/update/delete), transaction<T>, close
-- Error handling
-
-**Implementation highlights**:
-- dbPath = process.env.SQLITE_PATH ?? "./data/app.db"
-- SqlParams = Record<string, unknown> | unknown[]
-- All repositories use this wrapper; direct better-sqlite3 access forbidden
-
-### 2. Migrator: `lib/db/migrator.ts`
-
-**Responsibilities**:
-- Create schema_migrations table
-- Read .sql files from migrations dir in filename order
-- Skip already-applied files (tracked in schema_migrations)
-- Execute each file in a transaction; rollback on failure
-
-### 3. Initial Schema: `lib/db/migrations/001_initial.sql`
-
-16 tables: users, projects, project_members, board_threads, board_comments, chat_messages, todo_columns, todo_items, file_assets, project_notes, milestones, calendar_events, meetings, meeting_members, notifications, activity_logs + indexes.
-
-### 4. Entity Types: `lib/types/`
-
-PascalCase type files for each entity + union types (UserRole, UserStatus, ProjectStatus, ProjectMemberRole, etc.).
-
-### 5. UserRepository
-
-findById, findByEmail, create (with passwordHash), update (name/avatarUrl/role/status).
-
-### 6. AuthService
-
-register (hash password, create user), login (verify hash, issue session), logout, getCurrentUser, updateProfile. Uses bcrypt.
-
-### 7. Session: `lib/auth/session.ts`, `lib/auth/getCurrentUser.ts`
-
-Cookie-based session. getCurrentUser resolves the user from the request cookie.
-
-### 8. ProjectRepository / ProjectMemberRepository
-
-Project: findById, findByOwner, findByUser (via join), create, update, delete.
-ProjectMember: findByProject, findByUser, add, remove, isMember, getRole.
-
-### 9. ProjectService
-
-createProject (owner becomes admin member), updateProject, addMember (permission check + notification hook later), removeMember, archiveProject, getDashboard skeleton.
-
-## Data Flow
-
-### Login
-1. POST /api/auth/login → AuthService.login(email, password)
-2. AuthService → UserRepository.findByEmail → verify bcrypt hash
-3. Issue session cookie → return user
-
-### Project creation
-1. POST /api/projects → ProjectService.createProject(actorId, input)
-2. ProjectService → permission (any authenticated user) → ProjectRepository.create
-3. ProjectMemberRepository.add(projectId, ownerId, 'admin')
-4. Return project
-
-## Error Handling Strategy
-
-### Custom Error Classes
-- ValidationError (400) - field, value
-- ForbiddenError (403)
-- NotFoundError (404) - resource, id
-- (409 for unique constraint - handled via SQLite error code)
-
-### Error Handling Patterns
-Route Handlers catch errors and map to HTTP status. Expected errors use custom classes; unexpected errors propagate + log.
-
-## Test Strategy
-
-### Unit Tests (Vitest)
-- lib/db/sqlite.test.ts (query/get/execute/transaction, WAL, foreign keys)
-- lib/db/migrator.test.ts (order, skip applied, rollback)
-- repositories/UserRepository.test.ts
-- services/AuthService.test.ts
-- repositories/ProjectRepository.test.ts
-- repositories/ProjectMemberRepository.test.ts
-- services/ProjectService.test.ts
-
-Tests use a temp SQLite file (in-memory or tmpdir) to avoid touching real data/.
-
-### Integration Tests (Vitest)
-- project-member-permission.test.ts (non-member cannot access project data)
-
-### E2E Tests (Playwright)
-- auth.spec.ts (login, logout, protected screen)
-- project-management.spec.ts (create, edit, member add/remove, archive)
-
-## Dependent Libraries
-
-```json
-{
-  "dependencies": {
-    "next": "15",
-    "react": "19",
-    "react-dom": "19",
-    "better-sqlite3": "^11",
-    "bcrypt": "^5",
-    "react-markdown": "^9",
-    "remark-gfm": "^4",
-    "rehype-sanitize": "^6"
-  },
-  "devDependencies": {
-    "tailwindcss": "^3",
-    "@types/better-sqlite3": "^7",
-    "@types/bcrypt": "^5",
-    "@playwright/test": "^1",
-    "tsx": "^4"
-  }
-}
-```
-
-## Directory Structure
-
-```
-app/
-  api/auth/{register,login,logout,me}/route.ts
-  api/users/me/route.ts
-  api/projects/route.ts
-  api/projects/[projectId]/route.ts
-  api/projects/[projectId]/members/route.ts
-  api/projects/[projectId]/members/[userId]/route.ts
-  api/admin/migrations/route.ts
-  login/page.tsx
-  profile/page.tsx
-  dashboard/page.tsx
-  projects/[projectId]/{page,members,settings}.tsx
-  layout.tsx, globals.css
-lib/
-  db/{sqlite.ts, migrator.ts, run-migrations.ts, migrations/001_initial.sql}
-  auth/{session.ts, getCurrentUser.ts}
-  types/*.ts
-  validators/{userValidator.ts, projectValidator.ts}
-repositories/{UserRepository,ProjectRepository,ProjectMemberRepository}.ts
-services/{AuthService,ProjectService}.ts
-components/layout/{Header,Sidebar,ProjectNav}.tsx
-tests/unit/..., tests/integration/..., tests/e2e/...
-```
-
-## Implementation Order
-
-1. M1 (branch feature/m1-setup): Next.js setup, deps, config, dir structure, remove boilerplate → merge to main
-2. M2 (branch feature/m2-db-foundation): SQL wrapper, migrator, schema, types, migration API, unit tests → merge to main
-3. M3 (branch feature/m3-auth-user): UserRepository, AuthService, session, validators, auth API, login/profile pages, unit + e2e → merge to main
-4. M4 (branch feature/m4-project-member): Project/Member repos, ProjectService, project API, dashboard/members/settings pages, unit + integration + e2e → merge to main
-
-## Security Considerations
-
-- Passwords hashed with bcrypt (never plaintext)
-- All SQL parameter-bound (no string concatenation)
-- Auth required on all protected routes (except /api/auth/register, /api/auth/login)
-- Project access requires isMember check
-- Admin features require role='system_admin'
-- .env not committed; secrets via environment
-
-## Performance Considerations
-
-- SQLite WAL mode for read/write concurrency
-- Pagination on list endpoints
-- Singleton DB connection
-
-## Future Extensibility
-
-- Repository pattern allows adding tables without changing wrapper
-- SseEvent type extensible (M8)
-- NotificationService/ActivityLogService hooks prepared for M5 (ProjectService.addMember will call notification in M5)

.steering/20260624-m1-m4-foundation/requirements.md

@@ -1,102 +0,0 @@
-# Requirements
-
-## Overview
-
-Implement milestones M1-M4 of the Simple Groupware project: project foundation setup (Next.js 15), DB foundation (SQL wrapper + Migration), authentication & user management, and project & member management. Each milestone is developed on a separate branch and merged to main. Unit tests and E2E tests are mandatory.
-
-## Background
-
-The repository is currently a spec-driven-development boilerplate (vitest/eslint/prettier/husky configured, but no Next.js, no react, no SQLite). It must be transformed into the foundation of the Simple Groupware: a Next.js 15 + TypeScript + SQLite(better-sqlite3) application following the layered architecture (UI → Service → Repository → Data) defined in `docs/architecture.md`. M1-M4 establish the base that all subsequent milestones (M5+) depend on.
-
-## Features to Implement
-
-### 1. M1: Project Foundation Setup
-- Next.js 15 (App Router, TypeScript) project configuration
-- Tailwind CSS setup
-- tsconfig with `@/*` path alias, strict mode
-- next.config, .env.example
-- Directory structure: app/, lib/, repositories/, services/, components/, tests/, data/, backups/
-- ESLint (with Next.js plugin), Prettier, Husky, lint-staged, Vitest, Playwright setup
-- CI config (GitHub Actions)
-- package.json scripts: lint, format, typecheck, test, test:e2e, migrate, dev, build
-- Dependencies: next, react, react-dom, better-sqlite3, bcrypt, react-markdown, remark-gfm, rehype-sanitize, tailwindcss, @types/better-sqlite3
-- Remove boilerplate src/example.ts and src/example.test.ts
-
-### 2. M2: DB Foundation (SQL Wrapper + Migration)
-- `lib/db/sqlite.ts`: SqliteDatabase class (query/get/execute/transaction/close) + getDb() singleton (WAL, foreign_keys ON)
-- `lib/db/migrator.ts`: Migrator class (filename-order execution, skip applied, 1-file-1-transaction, rollback on failure)
-- `lib/db/migrations/001_initial.sql`: all 16 tables + indexes
-- `lib/types/`: all Entity type definitions + enums
-- `lib/db/run-migrations.ts`: migration runner script
-- API: `GET /api/admin/migrations` (admin-only migration status)
-- Unit tests: sqlite.test.ts, migrator.test.ts
-
-### 3. M3: Authentication & User Management
-- UserRepository (findById/findByEmail/create/update)
-- AuthService (register/login/logout/getCurrentUser/updateProfile) with bcrypt password hashing
-- Role management (system_admin/project_admin/member/guest), account enable/disable
-- lib/auth/ (session.ts, getCurrentUser.ts)
-- lib/validators/userValidator.ts
-- API: register, login, logout, me, users/me
-- Login page, profile page, root layout
-- Auth middleware (redirect unauthenticated to login)
-- Unit tests: UserRepository, AuthService; E2E test: auth.spec.ts
-
-### 4. M4: Project & Member Management
-- ProjectRepository, ProjectMemberRepository
-- ProjectService (createProject/updateProject/addMember/removeMember/archiveProject/getDashboard) with permission checks
-- projectValidator.ts
-- API: projects CRUD, members CRUD
-- Dashboard (project list), project overview, members page, settings page
-- Layout components (Header, Sidebar, ProjectNav)
-- Unit tests: ProjectRepository, ProjectMemberRepository, ProjectService; Integration test: project-member-permission; E2E test: project-management.spec.ts
-
-## Acceptance Criteria
-
-### M1
-- [ ] `npm run dev` starts the Next.js dev server
-- [ ] `npm run lint`, `npm run typecheck`, `npm run build` succeed
-- [ ] Directory structure matches repository-structure.md
-
-### M2
-- [ ] `npm run migrate` creates the initial schema
-- [ ] Migrations run in filename order and skip applied ones
-- [ ] Failed migration rolls back
-- [ ] Unit tests pass
-
-### M3
-- [ ] User registration, login, logout work
-- [ ] Password is hashed with bcrypt
-- [ ] Profile & avatar editable
-- [ ] Inactive accounts cannot log in
-- [ ] Unauthenticated access to protected screens is blocked
-- [ ] Unit & E2E tests pass
-
-### M4
-- [ ] Project create/edit/delete/archive work
-- [ ] Member add/remove/role work
-- [ ] Non-members get 403
-- [ ] Unit, Integration & E2E tests pass
-
-## Success Metrics
-
-- All Unit tests pass (`npm test`)
-- All E2E tests pass (`npm run test:e2e`)
-- Lint and typecheck clean
-- Each milestone merged to main on its own branch
-
-## Out of Scope
-
-The following will not be implemented in this phase:
-- M5-M15 (notifications, board, chat, SSE, todo, files, calendar, milestones, meetings, search, dashboard completion, backup)
-- E2E tests for features beyond M3/M4 scope (board, chat, etc.)
-- Full project dashboard content (only skeleton in M4; full content in M13)
-
-## Reference Documents
-
-- `docs/product-requirements.md` - Product Requirements Document
-- `docs/functional-design.md` - Functional design document
-- `docs/architecture.md` - Architecture design document
-- `docs/repository-structure.md` - Repository structure document
-- `docs/development-guidelines.md` - Development guidelines
-- `docs/milestones.md` - Milestone & task definitions

.steering/20260624-m1-m4-foundation/tasklist.md

@@ -1,150 +0,0 @@
-# Task List
-
-## 🚨 Principle of Fully Completing Tasks
-
-**Keep working until all tasks in this file are complete**
-
-### Mandatory Rules
-- **Make every task `[x]`**
-- "Planned as a separate task due to time constraints" is forbidden
-- "Postponed because the implementation is too complex" is forbidden
-- Do not finish work while leaving incomplete tasks (`[ ]`)
-
-### The Only Case Where Skipping a Task Is Permitted
-Skipping is possible only when one of the following technical reasons applies:
-- A change in the implementation approach made the feature itself unnecessary
-- An architecture change replaced it with a different implementation method
-- A change in dependencies made the task impossible to execute
-
-When skipping, always state the reason clearly:
-```markdown
-- [x] ~~task name~~ (unnecessary due to a change in approach: specific technical reason)
-```
-
-### If a Task Is Too Large
-- Split the task into smaller subtasks
-- Add the split subtasks to this file
-- Complete the subtasks one by one
-
----
-
-## Phase 1: M1 - Project Foundation Setup (branch: feature/m1-setup)
-
-- [x] Create branch `feature/m1-setup` from main
-- [x] Update package.json: name, scripts (dev/build/lint/format/typecheck/test/test:e2e/migrate), dependencies (next, react, react-dom, better-sqlite3, bcrypt, react-markdown, remark-gfm, rehype-sanitize), devDependencies (tailwindcss, @types/better-sqlite3, @types/bcrypt, @playwright/test, tsx, eslint-config-next)
-- [x] Run `npm install` and confirm dependencies install successfully
-- [x] Configure Next.js: create next.config.mjs (Node.js runtime), update tsconfig.json for Next.js (@/* path alias, jsx preserve, next plugin types), create app/globals.css (Tailwind directives), create tailwind.config.ts, postcss.config.mjs
-- [x] Create Next.js app structure: app/layout.tsx (root layout), app/page.tsx (home redirect), app/globals.css
-- [x] Create directory structure: lib/, repositories/, services/, components/, tests/unit, tests/integration, tests/e2e, data/.gitkeep, backups/.gitkeep
-- [x] Remove boilerplate: delete src/example.ts, src/example.test.ts
-- [x] Update vitest.config.ts (include tests/**, exclude .next), create playwright.config.ts
-- [x] Update eslint.config.js (add Next.js plugin/ignores for .next), update .prettierrc if needed
-- [x] Create .env.example (SQLITE_PATH, SESSION_SECRET)
-- [x] Create CI config .github/workflows/ci.yml (lint, typecheck, test, build)
-- [x] Commit M1, merge feature/m1-setup to main, push
-
-## Phase 2: M2 - DB Foundation (branch: feature/m2-db-foundation)
-
-- [ ] Create branch `feature/m2-db-foundation` from main
-- [ ] Implement `lib/db/sqlite.ts`: SqliteDatabase class (query/get/execute/transaction/close) + getDb() singleton (WAL, foreign_keys ON)
-- [ ] Implement `lib/db/migrator.ts`: Migrator class (schema_migrations table, filename-order, skip applied, 1-file-1-tx, rollback)
-- [ ] Create `lib/db/migrations/001_initial.sql`: all 16 tables + indexes
-- [ ] Create `lib/types/`: all Entity types + enums (User, Project, ProjectMember, BoardThread, BoardComment, ChatMessage, TodoColumn, TodoItem, FileAsset, ProjectNote, Milestone, CalendarEvent, Meeting, MeetingMember, Notification, ActivityLog, SchemaMigration + union types)
-- [ ] Create `lib/db/run-migrations.ts`: migration runner script
-- [ ] Implement API `GET /api/admin/migrations` (migration status, admin-only)
-- [ ] Create test helper `tests/helpers/db.ts` (temp SQLite DB factory)
-- [ ] Write Unit test `tests/unit/lib/db/sqlite.test.ts`
-- [ ] Write Unit test `tests/unit/lib/db/migrator.test.ts`
-- [ ] Run `npm run migrate` to verify schema creation
-- [ ] Commit M2, merge feature/m2-db-foundation to main, push
-
-## Phase 3: M3 - Auth & User Management (branch: feature/m3-auth-user)
-
-- [ ] Create branch `feature/m3-auth-user` from main
-- [ ] Create custom error classes `lib/errors.ts` (ValidationError, ForbiddenError, NotFoundError)
-- [ ] Implement `lib/auth/session.ts` (session cookie read/write) and `lib/auth/getCurrentUser.ts`
-- [ ] Implement `lib/validators/userValidator.ts`
-- [ ] Implement `repositories/UserRepository.ts`
-- [ ] Implement `services/AuthService.ts` (register/login/logout/getCurrentUser/updateProfile, bcrypt)
-- [ ] Implement API routes: register, login, logout, me, users/me
-- [ ] Implement auth middleware/guard (protected routes redirect to login)
-- [ ] Implement `app/login/page.tsx`, `app/profile/page.tsx`, update `app/layout.tsx`
-- [ ] Write Unit test `tests/unit/repositories/UserRepository.test.ts`
-- [ ] Write Unit test `tests/unit/services/AuthService.test.ts`
-- [ ] Write E2E test `tests/e2e/auth.spec.ts`
-- [ ] Commit M3, merge feature/m3-auth-user to main, push
-
-## Phase 4: M4 - Project & Member Management (branch: feature/m4-project-member)
-
-- [ ] Create branch `feature/m4-project-member` from main
-- [ ] Implement `lib/validators/projectValidator.ts`
-- [ ] Implement `repositories/ProjectRepository.ts`
-- [ ] Implement `repositories/ProjectMemberRepository.ts`
-- [ ] Implement `services/ProjectService.ts` (createProject/updateProject/addMember/removeMember/archiveProject/getDashboard skeleton, permission checks)
-- [ ] Implement API routes: projects (list/create), projects/[projectId] (detail/edit/delete), members (list/add), members/[userId] (remove)
-- [ ] Implement `app/dashboard/page.tsx` (project list skeleton)
-- [ ] Implement `app/projects/[projectId]/page.tsx` (overview skeleton)
-- [ ] Implement `app/projects/[projectId]/members/page.tsx`
-- [ ] Implement `app/projects/[projectId]/settings/page.tsx`
-- [ ] Implement layout components: components/layout/Header.tsx, Sidebar.tsx, ProjectNav.tsx
-- [ ] Write Unit test `tests/unit/repositories/ProjectRepository.test.ts`
-- [ ] Write Unit test `tests/unit/repositories/ProjectMemberRepository.test.ts`
-- [ ] Write Unit test `tests/unit/services/ProjectService.test.ts`
-- [ ] Write Integration test `tests/integration/project-member-permission.test.ts`
-- [ ] Write E2E test `tests/e2e/project-management.spec.ts`
-- [ ] Commit M4, merge feature/m4-project-member to main, push
-
-## Phase 5: Quality Check and Fixes
-
-- [ ] Confirm that all tests pass
-  - [ ] `npm test`
-- [ ] Confirm that there are no lint errors
-  - [ ] `npm run lint`
-- [ ] Confirm that there are no type errors
-  - [ ] `npm run typecheck`
-- [ ] Confirm that the build succeeds
-  - [ ] `npm run build`
-
-## Phase 6: Documentation Updates
-
-- [ ] Update README.md (setup instructions, scripts)
-- [ ] Post-implementation retrospective (record at the bottom of this file)
-
----
-
-## Post-Implementation Retrospective
-
-### Implementation Completion Date
-{YYYY-MM-DD}
-
-### Differences Between Plan and Actual
-
-**Points that differed from the plan**:
-- {Technical changes not anticipated at planning time}
-- {Changes in the implementation approach and the reasons}
-
-**Tasks that became newly necessary**:
-- {Tasks added during implementation}
-- {Why the addition was necessary}
-
-**Tasks skipped for technical reasons** (only when applicable):
-- {Task name}
-  - Reason for skipping: {specific technical reason}
-  - Alternative implementation: {what it was replaced with}
-
-**⚠️ Note**: Do not list tasks skipped for reasons such as "time constraints" or "difficulty" here. Completing all tasks is the principle.
-
-### Lessons Learned
-
-**Technical insights**:
-- {Technical knowledge gained through implementation}
-- {New technologies or patterns used}
-
-**Process improvements**:
-- {What went well in task management}
-- {How the steering files were leveraged}
-
-### Improvement Suggestions for Next Time
-- {Things to watch out for in the next feature addition}
-- {More efficient implementation methods}
-- {Improvements to task planning}

README.md

@@ -1,396 +1,288 @@
-# opencode Spec-Driven Development Boilerplate
+# OpenGroupware
 
-A spec-driven development boilerplate for [opencode](https://opencode.ai), converted from the
+A simple, self-contained, project-based groupware built with **Next.js 15**, **TypeScript**, and
-[Claude Code boilerplate](https://git.yasue.org/ken/claudecode-boilerplate) that accompanies the book
+**SQLite**. It runs entirely on Node.js (no external database or storage) and provides boards,
-*"Practical Claude Code Introduction."*
+Markdown notes, realtime chat (SSE), a Kanban ToDo board, file sharing, a calendar with milestones,
+meetings with schedule-conflict detection, search, dashboards, and admin backups.
 
-It gives opencode a structured workflow for turning ideas into production code through persistent design
+The codebase follows a strict **layered architecture**:
-documents, per-task steering files, AI skills, subagents, and slash commands.
+
+```
+UI (app/) → Service (services/) → Repository (repositories/) → Data (lib/db/)
+```
+
+Dependencies flow one direction only; SQL is always parameter-bound and accessed through the
+`SqliteDatabase` wrapper (never `better-sqlite3` directly in repositories).
 
 ---
 
 ## Table of Contents
 
-- [What Is Spec-Driven Development?](#what-is-spec-driven-development)
-- [Conversion Summary (Claude Code → opencode)](#conversion-summary-claude-code--opencode)
 - [Prerequisites](#prerequisites)
-- [Quick Start](#quick-start)
+- [How to Start](#how-to-start)
-- [Directory Structure](#directory-structure)
+- [How to Test](#how-to-test)
-- [Configuration Overview](#configuration-overview)
+- [How to Develop](#how-to-develop)
-- [Usage Workflow](#usage-workflow)
+- [Environment Variables](#environment-variables)
-- [Commands Reference](#commands-reference)
+- [Project Structure](#project-structure)
-- [Skills Reference](#skills-reference)
+- [npm Scripts Reference](#npm-scripts-reference)
-- [Agents Reference](#agents-reference)
-- [Customizing the Boilerplate](#customizing-the-boilerplate)
 - [Troubleshooting](#troubleshooting)
 - [License](#license)
 
 ---
 
-## What Is Spec-Driven Development?
-
-Spec-driven development separates **"what to build"** from **"how to build it"**:
-
-1. **Persistent documents** (`docs/`) — the north-star design (PRD, functional design, architecture, etc.)
-2. **Steering files** (`.steering/`) — per-task plans created fresh for each piece of work
-3. **Implementation** — the agent follows `tasklist.md`, updating progress as it goes
-4. **Verification** — tests, lint, typecheck, and a retrospective
-
-opencode loads the right skill automatically based on what you're doing, so you don't have to think about
-the process — just describe what you want.
-
----
-
-## Conversion Summary (Claude Code → opencode)
-
-| Claude Code | opencode | Notes |
-|---|---|---|
-| `CLAUDE.md` | `AGENTS.md` | Referenced via `instructions` in `opencode.json` |
-| `.claude/settings.json` | `opencode.json` | Permissions converted to opencode's `permission` schema |
-| `.claude/agents/*.md` | `.opencode/agent/*.md` | Added `mode: subagent`; `model: sonnet` removed (inherits default) |
-| `.claude/commands/*.md` | `.opencode/command/*.md` | Tool-call syntax (`Bash()`, `Grep()`, `Skill()`) converted to natural instructions; `$ARGUMENTS` added |
-| `.claude/skills/*/SKILL.md` | `.opencode/skills/*/SKILL.md` | `allowed-tools` frontmatter removed (not an opencode field) |
-| `Skill('steering')` calls | Auto-loaded by description | opencode surfaces skills via `description` matching |
-| `TodoWrite` / `Edit` tool refs | `todowrite` / `edit` | Lowercased to match opencode tool names |
-| Claude Code devcontainer feature | `curl … opencode.ai/install` | Replaced Anthropic feature with opencode install script |
-
-All skill templates and guides were preserved verbatim except for `.claude/` path references and
-"Claude Code" mentions, which were updated to `.opencode/` and "opencode" respectively.
-
----
-
 ## Prerequisites
 
-- **Node.js** v18+ (v24.11.0 recommended)
+- **Node.js** v24.11.0 (LTS; v18+ works) — the dev container pins this version
-- **npm**
+- **npm** 11.x (bundled with Node.js)
-- **opencode** — install with:
+- **Playwright browsers** for E2E tests (see [How to Test](#how-to-test))
-  ```bash
+
-  curl -fsSL https://opencode.ai/install | bash
+A Dev Container configuration (`.devcontainer/`) is included for VS Code.
-  ```
-  See <https://opencode.ai/docs> for alternatives (npm, Homebrew, etc.)
-- **Docker** (only if using the Dev Container)
 
 ---
 
-## Quick Start
+## How to Start
-
-### Option A — Dev Container (recommended)
-
-1. Open this folder in **VS Code**.
-2. When prompted, click **"Reopen in Container"** (or run the command
-   *Dev Containers: Reopen in Container*).
-3. The container automatically:
-   - Installs Node.js LTS
-   - Runs `npm install`
-   - Installs opencode
-4. Open a terminal and start opencode:
-   ```bash
-   opencode
-   ```
-
-### Option B — Manual setup
 
 ```bash
 # 1. Install dependencies
 npm install
 
-# 2. Set up Git hooks
+# 2. Create your local environment file
-npm run prepare
+cp .env.example .env
+#   Edit .env if you want to change SQLITE_PATH / SESSION_SECRET / UPLOADS_PATH.
+#   SESSION_SECRET is required — the app will not start without it.
 
-# 3. Start opencode
+# 3. Initialize the database (runs all SQL migrations)
-opencode
+npm run migrate
+
+# 4. Start the development server
+npm run dev
+```
+
+The app is then available at **http://localhost:3000**.
+
+- The first user you register becomes a regular `member`. To use admin features
+  (backups, migration status), promote a user to `system_admin` in the DB, or seed one:
+  ```bash
+  npx tsx -e "import('./lib/db/sqlite.ts').then(async m => { \
+    const { UserRepository } = await import('./repositories/UserRepository.ts'); \
+    const bcrypt = (await import('bcrypt')).default; \
+    const db = new m.SqliteDatabase(process.env.SQLITE_PATH ?? './data/app.db'); \
+    new UserRepository(db).create({ name:'Admin', email:'admin@example.com', \
+      passwordHash: bcrypt.hashSync('admin123', 10), role:'system_admin' }); db.close(); })"
+  ```
+- The SQLite database lives at `./data/app.db` (and uploads under `./data/uploads/`). Both are
+  git-ignored. Deleting `./data/` and re-running `npm run migrate` gives a clean slate.
+
+### Production build
+
+```bash
+npm run build
+npm run start      # serves the optimized build on http://localhost:3000
 ```
 
 ---
 
-## Directory Structure
+## How to Test
+
+There are three test layers: **Unit/Integration** (Vitest) and **E2E** (Playwright).
+
+### Unit & integration tests (Vitest)
+
+```bash
+npm test                 # run all unit/integration tests once
+npm run test:watch       # watch mode
+npm run test:coverage    # run with coverage (threshold: 80% for repositories/** + services/**)
+```
+
+These use a real temporary SQLite database per test (see `tests/helpers/db.ts`) and cover every
+Repository, Service, and the key algorithms (schedule-conflict, milestone progress, session tokens,
+notification targeting).
+
+### End-to-end tests (Playwright)
+
+```bash
+npm run test:e2e         # run the full E2E suite (headless)
+npm run test:e2e:ui      # interactive UI mode — test tree + per-step screenshots/traces
+```
+
+Before running E2E:
+
+```bash
+# Install the Chromium browser once (per machine)
+npx playwright install chromium
+```
+
+How E2E works:
+- Playwright's `webServer` runs `npm run migrate && npm run dev` automatically, so the DB is
+  initialized and the dev server is started for you.
+- A `globalSetup` (`tests/e2e/globalSetup.ts`) seeds an `admin@example.com` / `admin123`
+  (`system_admin`) account used by the admin/backup tests.
+- The suite runs with `workers: 1` for deterministic behavior (the realtime SSE test needs low
+  contention against the single dev server).
+- E2E specs live in `tests/e2e/*.spec.ts` (auth, project-management, board, notes, chat-sse,
+  todo-kanban, file-sharing, calendar, meetings, search/dashboard, notifications, activity-log,
+  backup).
+
+### Lint, type-check, build
+
+```bash
+npm run lint
+npm run typecheck
+npm run build
+```
+
+Run all three green before committing. A pre-commit hook (Husky + lint-staged) auto-fixes and
+formats staged files.
+
+### Recommended full check before opening a PR
+
+```bash
+npm run lint && npm run typecheck && npm test && npm run build && npm run test:e2e
+```
+
+---
+
+## How to Develop
+
+### Typical workflow
+
+1. Branch from `main`: `git checkout -b feature/<name>` (or `fix/`, `refactor/`).
+2. Implement following the layered architecture and coding conventions (see
+   `docs/development-guidelines.md`):
+   - Route handlers in `app/api/.../route.ts` start with `export const runtime = 'nodejs';` (Edge
+     runtime is forbidden because of better-sqlite3).
+   - Services do permission checks and call repositories; repositories hold SQL and use parameter
+     binding (`@param`) and `deleted_at IS NULL` for soft-deleted tables.
+   - Map DB `snake_case` columns to camelCase entity fields in repository mappers.
+   - All list endpoints paginate (`LIMIT`/`OFFSET`).
+3. Add Unit tests for any new Repository/Service, and an E2E spec for user-facing flows.
+4. Ensure `npm run lint`, `npm run typecheck`, `npm test`, and `npm run build` are green.
+5. Merge to `main` (merge commit). Milestones in this project were delivered one per branch, each
+   merged to `main` before the next branched off.
+
+### Database migrations
+
+Migrations are plain SQL files in `lib/db/migrations/`, named `NNN_description.sql` and run in
+filename order. Each file runs in its own transaction and is recorded in `schema_migrations`.
+
+```bash
+npm run migrate          # apply pending migrations
+```
+
+To add a schema change, create e.g. `lib/db/migrations/002_add_column.sql` and re-run
+`npm run migrate`. Never edit an already-applied migration — add a new one.
+
+### Realtime (SSE)
+
+`lib/sse/hub.ts` (`SseHub`) keeps an in-memory set of clients per project and broadcasts events only
+to that project's clients. Services inject the hub and call `broadcast(projectId, event)`; the
+stream endpoint `GET /api/projects/:projectId/chat/stream` registers a client and cleans up on
+abort. The chat UI uses `EventSource` (auto-reconnect).
+
+### Sessions & auth
+
+Stateless signed-cookie sessions (`lib/auth/session.ts`): the cookie is
+`base64url({uid,iat}).base64url(hmacSha256(secret, payload))`, verified server-side with
+`crypto.timingSafeEqual` and an `iat` expiry check. `middleware.ts` does a coarse cookie-presence
+redirect for pages; the real HMAC + DB verification happens in `getCurrentUser` (Node runtime).
+
+### Where things live
+
+| Concern | Location |
+|---|---|
+| Pages & API routes | `app/` |
+| Business logic, permissions | `services/` |
+| SQL & data access | `repositories/` |
+| DB wrapper, migrations, SSE, auth, types, validators | `lib/` |
+| React components | `components/` |
+| Tests | `tests/unit`, `tests/integration`, `tests/e2e` |
+
+### Spec-driven workflow (optional)
+
+This project also ships an opencode spec-driven workflow (see `AGENTS.md`, `docs/`, `.steering/`,
+`.opencode/`). Persistent design docs live in `docs/`; per-task plans live in
+`.steering/[YYYYMMDD]-[name]/`. You can drive new work with `/add-feature <name>` in opencode, but
+normal Git + `npm` development works too.
+
+---
+
+## Environment Variables
+
+Configured via `.env` (copy from `.env.example`):
+
+| Variable | Default | Purpose |
+|---|---|---|
+| `SQLITE_PATH` | `./data/app.db` | SQLite database file path |
+| `SESSION_SECRET` | _(must set)_ | HMAC secret for signing session cookies |
+| `UPLOADS_PATH` | `./data/uploads` | Directory for uploaded files |
+
+`SESSION_SECRET` must be set — the app throws on startup if it is missing. Never commit `.env`.
+
+---
+
+## Project Structure
 
 ```
 .
-├── opencode.json              # opencode config (permissions, instructions)
+├── app/                 # Next.js App Router: pages + Route Handlers (all runtime='nodejs')
-├── AGENTS.md                  # Project instructions (loaded into every session)
+│   ├── api/             # REST/SSE endpoints
-├── package.json               # Node.js project + scripts
+│   ├── projects/[projectId]/  # project screens (board, notes, chat, todos, files, calendar, ...)
-├── tsconfig.json              # TypeScript config
+│   ├── admin/backups/   # admin-only backup screen
-├── eslint.config.js           # ESLint flat config
+│   └── login / profile / dashboard / notifications
-├── vitest.config.ts           # Vitest config (80% coverage threshold)
+├── lib/
-├── .prettierrc / .prettierignore
+│   ├── db/              # SqliteDatabase, Migrator, migrations/*.sql
-├── .gitignore
+│   ├── sse/             # SseHub
-├── .husky/pre-commit          # Runs lint-staged + typecheck before commit
+│   ├── auth/            # session, getCurrentUser
-├── .devcontainer/devcontainer.json
+│   ├── types/           # entity & event types
-├── prompt.md                  # Example MVP prompt
+│   ├── validators/      # input validators
-│
+│   ├── api/             # service factories + error handling for route handlers
-├── src/                       # Source code
+│   └── errors.ts        # AppError hierarchy (ValidationError, ForbiddenError, ...)
-│   ├── example.ts
+├── repositories/        # one class per table (SQL + mapping)
-│   └── example.test.ts
+├── services/            # business logic + permission checks + side effects
-│
+├── components/          # React components by area (layout, board, chat, todo, ...)
-├── docs/                      # Persistent design documents (created by /setup-project)
+├── tests/
-│   └── ideas/
+│   ├── unit/            # Vitest — mirrors source structure
-│       └── initial-requirements.md   # Brainstorming notes (pre-PRD)
+│   ├── integration/     # Vitest — real temp SQLite DB
-│
+│   ├── e2e/             # Playwright specs + globalSetup.ts
-├── .steering/                 # Per-task steering files (created by /add-feature)
+│   └── helpers/db.ts    # createTestDb() / createMigratedTestDb()
-│   └── .gitkeep
+├── data/                # git-ignored: app.db, uploads/
-│
+├── backups/             # git-ignored: backup-<timestamp>.zip
-└── .opencode/                 # opencode configuration
+├── docs/                # persistent design docs (PRD, architecture, milestones, ...)
-    ├── agent/                 # Subagent definitions
+└── .steering/           # per-task plans (git-ignored working artifacts)
-    │   ├── doc-reviewer.md
-    │   └── implementation-validator.md
-    ├── command/               # Slash commands
-    │   ├── setup-project.md
-    │   ├── add-feature.md
-    │   └── review-docs.md
-    └── skills/                # Task-specific skills
-        ├── prd-writing/           (SKILL.md + template.md)
-        ├── functional-design/     (SKILL.md + template.md + guide.md)
-        ├── architecture-design/   (SKILL.md + template.md + guide.md)
-        ├── repository-structure/  (SKILL.md + template.md + guide.md)
-        ├── development-guidelines/(SKILL.md + template.md + guides/)
-        ├── glossary-creation/     (SKILL.md + template.md + guide.md)
-        └── steering/              (SKILL.md + templates/)
 ```
 
 ---
 
-## Configuration Overview
+## npm Scripts Reference
 
-### `opencode.json`
+| Script | Description |
-
+|---|---|
-The main configuration file. Key sections:
+| `npm run dev` | Start the Next.js dev server (http://localhost:3000) |
-
+| `npm run build` | Production build |
-```jsonc
+| `npm run start` | Serve the production build |
-{
+| `npm run lint` | ESLint |
-  "$schema": "https://opencode.ai/config.json",
+| `npm run format` | Prettier (write) |
-  "instructions": ["AGENTS.md"],     // Loaded into every session
+| `npm run typecheck` | `tsc --noEmit` |
-  "permission": {
+| `npm test` | Run unit/integration tests (Vitest, once) |
-    "skill": "allow",                // Skills are auto-available
+| `npm run test:watch` | Vitest watch mode |
-    "bash": {                        // Common dev commands pre-approved
+| `npm run test:coverage` | Vitest with coverage (80% threshold on repos+services) |
-      "*": "ask",
+| `npm run test:e2e` | Playwright E2E (headless, full suite) |
-      "npm *": "allow",
+| `npm run test:e2e:ui` | Playwright interactive UI mode (screenshots + traces) |
-      "npx *": "allow",
+| `npm run migrate` | Apply SQL migrations |
-      "git *": "allow",
-      // ...
-    }
-  }
-}
-```
-
-> **After editing `opencode.json`, quit and restart opencode** — config is loaded once at startup.
-
-### `AGENTS.md`
-
-The project memory file. opencode reads it on every session. It defines:
-- The technology stack
-- The spec-driven development principles
-- The directory structure
-- The development process and workflow
-
-### Agents (`.opencode/agent/`)
-
-Subagents run in isolated contexts via the `task` tool. They don't consume the main session's context.
-
-### Commands (`.opencode/command/`)
-
-Slash commands invoked in the opencode TUI with `/command-name`. Each command is a prompt template
-that opencode executes.
-
-### Skills (`.opencode/skills/`)
-
-Skills are loaded automatically based on their `description` field. You don't invoke them by name —
-opencode surfaces the right skill when the task matches.
-
----
-
-## Usage Workflow
-
-### 1. Initial project setup
-
-Run the setup command to create all six persistent design documents interactively:
-
-```
-> /setup-project
-```
-
-This creates (one at a time, with your approval):
-1. `docs/product-requirements.md` (PRD)
-2. `docs/functional-design.md`
-3. `docs/architecture.md`
-4. `docs/repository-structure.md`
-5. `docs/development-guidelines.md`
-6. `docs/glossary.md`
-
-The PRD is based on the brainstorming notes in `docs/ideas/initial-requirements.md`. Edit that file
-first if you have your own idea, or replace it.
-
-### 2. Add a feature
-
-```
-> /add-feature User authentication
-```
-
-This fully autonomous workflow:
-1. Creates `.steering/[YYYYMMDD]-[feature-name]/` with `requirements.md`, `design.md`, `tasklist.md`
-2. Generates the steering files (planning mode of the steering skill)
-3. Implements every task in `tasklist.md`, marking each `[ ]` → `[x]` as it goes
-4. Launches the `implementation-validator` subagent for quality review
-5. Runs `npm test`, `npm run lint`, `npm run typecheck`
-6. Records a retrospective in `tasklist.md`
-
-### 3. Review a document
-
-```
-> /review-docs docs/product-requirements.md
-```
-
-Launches the `doc-reviewer` subagent to evaluate the document from five perspectives:
-completeness, clarity, consistency, implementability, and measurability.
-
-### 4. Day-to-day editing
-
-You don't always need a command — just ask in normal conversation:
-
-```
-> Add a new feature to the PRD
-> Review the performance requirements in architecture.md
-> Add a new domain term to glossary.md
-```
-
-opencode loads the appropriate skill automatically.
-
----
-
-## Commands Reference
-
-| Command | Description | Example |
-|---|---|---|
-| `/setup-project` | Create the six persistent documents interactively | `/setup-project` |
-| `/add-feature` | Implement a feature end-to-end (autonomous) | `/add-feature User profile editing` |
-| `/review-docs` | Detailed document review via subagent | `/review-docs docs/architecture.md` |
-
----
-
-## Skills Reference
-
-| Skill | When it loads | Output |
-|---|---|---|
-| `prd-writing` | Creating a Product Requirements Document | `docs/product-requirements.md` |
-| `functional-design` | Creating a functional design document | `docs/functional-design.md` |
-| `architecture-design` | Designing the system architecture | `docs/architecture.md` |
-| `repository-structure` | Defining the directory layout | `docs/repository-structure.md` |
-| `development-guidelines` | Creating coding conventions / implementing code | `docs/development-guidelines.md` |
-| `glossary-creation` | Creating a project glossary | `docs/glossary.md` |
-| `steering` | Planning, implementing, and retrospecting on a task | `.steering/[date]-[name]/` files |
-
-Each skill folder contains a `SKILL.md` (instructions) plus `template.md` and/or `guide.md` (reference
-material the skill points to).
-
----
-
-## Agents Reference
-
-| Agent | Mode | Purpose |
-|---|---|---|
-| `doc-reviewer` | subagent | Reviews document quality across 5 dimensions; outputs a scored report with prioritized improvements |
-| `implementation-validator` | subagent | Validates code against the spec; checks quality, test coverage, security, performance; runs lint/test/typecheck |
-
-Agents are launched via the `task` tool (e.g., by the `/add-feature` and `/review-docs` commands).
-They run in an isolated context window.
-
----
-
-## Customizing the Boilerplate
-
-### Change the model
-
-Agents inherit the default model from `opencode.json`. To pin a specific model for a subagent, add
-`model` to its frontmatter:
-
-```yaml
----
-description: ...
-mode: subagent
-model: anthropic/claude-sonnet-4-6
----
-```
-
-Or set a global default in `opencode.json`:
-
-```jsonc
-{
-  "model": "anthropic/claude-sonnet-4-6"
-}
-```
-
-> Model IDs use the `provider/model-id` format. See <https://opencode.ai/config.json> for the full schema.
-
-### Adjust permissions
-
-Edit the `permission` block in `opencode.json`. For example, to allow all bash commands:
-
-```jsonc
-{
-  "permission": { "bash": "allow" }
-}
-```
-
-### Add a new skill
-
-1. Create `.opencode/skills/my-skill/SKILL.md`
-2. Add frontmatter with `name` and `description` (the description controls when opencode loads it)
-3. Add any companion `template.md` or `guide.md` files
-4. Restart opencode
-
-### Add a new command
-
-1. Create `.opencode/command/my-command.md`
-2. Add `description` frontmatter + a prompt body (use `$ARGUMENTS` for user input)
-3. Restart opencode
-
-### Add a new agent
-
-1. Create `.opencode/agent/my-agent.md`
-2. Add `description` and `mode: subagent` frontmatter + a prompt body
-3. Restart opencode
 
 ---
 
 ## Troubleshooting
 
-### opencode won't start after editing config
+- **App won't start: `SESSION_SECRET is not configured`** — create `.env` from `.env.example` and
-
+  set `SESSION_SECRET`.
-opencode validates `opencode.json` strictly and refuses to start on invalid fields. To recover:
+- **`npm run migrate` fails with "more than one statement"** — ensure the migrator uses
-
+  `SqliteDatabase.exec()` (it does); this is a historical footgun with `better-sqlite3`'s
-```bash
+  `prepare()`.
-# Skip the project config and start from globals only
+- **E2E: `Executable doesn't exist`** — run `npx playwright install chromium`.
-OPENCODE_DISABLE_PROJECT_CONFIG=1 opencode
+- **E2E: tests flaky/failing** — the suite is pinned to `workers: 1`; ensure no other `npm run dev`
-```
+  is occupying port 3000, and remove `./data/` before a clean run.
-
+- **Port 3000 busy** — stop the other process (`lsof -ti:3000 | xargs kill`) before running dev/E2E.
-Then fix the broken file and restart normally.
-
-### Skills not loading
-
-- Ensure each `SKILL.md` has a `description` in its frontmatter — skills without one are filtered out.
-- Ensure the folder name matches the `name` field.
-- Restart opencode after adding or changing skills.
-
-### Commands not appearing
-
-- Command files must be directly inside `.opencode/command/` (not in subdirectories).
-- Restart opencode after adding commands.
-
-### Dev Container: `opencode` command not found
-
-The install script adds opencode to `~/.opencode/bin/` and updates your shell profile. If the command
-isn't found in a new terminal:
-
-```bash
-export PATH="$HOME/.opencode/bin:$PATH"
-opencode
-```
-
-Or create a permanent symlink:
-
-```bash
-sudo ln -sf "$HOME/.opencode/bin/opencode" /usr/local/bin/opencode
-```
 
 ---
 

app/api/admin/migrations/route.ts

@@ -0,0 +1,27 @@
+import path from 'node:path';
+import { NextResponse } from 'next/server';
+import { Migrator } from '@/lib/db/migrator';
+import { getDb } from '@/lib/db/sqlite';
+import { getCurrentUser } from '@/lib/auth/getCurrentUser';
+import { UnauthorizedError, ForbiddenError } from '@/lib/errors';
+import { handleApiError } from '@/lib/api/handleError';
+
+export const runtime = 'nodejs';
+
+export async function GET() {
+  const user = await getCurrentUser();
+  if (!user) {
+    return handleApiError(new UnauthorizedError());
+  }
+  if (user.role !== 'system_admin') {
+    return handleApiError(new ForbiddenError('管理者のみアクセス可能です'));
+  }
+
+  try {
+    const migrationsDir = path.join(process.cwd(), 'lib', 'db', 'migrations');
+    const migrator = new Migrator(getDb(), migrationsDir);
+    return NextResponse.json({ migrations: migrator.getAppliedMigrations() });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}

app/api/auth/login/route.ts

@@ -0,0 +1,34 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { AuthService } from '@/services/AuthService';
+import { UserRepository } from '@/repositories/UserRepository';
+import { getDb } from '@/lib/db/sqlite';
+import { toPublicUser } from '@/lib/auth/getCurrentUser';
+import { setSessionCookie } from '@/lib/auth/session';
+import { handleApiError, jsonError } from '@/lib/api/handleError';
+
+export const runtime = 'nodejs';
+
+export async function POST(request: NextRequest) {
+  let body: Record<string, unknown>;
+  try {
+    body = (await request.json()) as Record<string, unknown>;
+  } catch {
+    return jsonError(400, 'リクエスト本文が不正です');
+  }
+
+  const authService = new AuthService(new UserRepository(getDb()));
+  try {
+    const { user, token } = authService.login(
+      String(body.email ?? ''),
+      String(body.password ?? '')
+    );
+    const response = NextResponse.json(
+      { user: toPublicUser(user) },
+      { status: 200 }
+    );
+    setSessionCookie(response, token);
+    return response;
+  } catch (error) {
+    return handleApiError(error);
+  }
+}

app/api/auth/logout/route.ts

@@ -0,0 +1,10 @@
+import { NextResponse } from 'next/server';
+import { clearSessionCookie } from '@/lib/auth/session';
+
+export const runtime = 'nodejs';
+
+export async function POST() {
+  const response = NextResponse.json({ ok: true });
+  clearSessionCookie(response);
+  return response;
+}

app/api/auth/me/route.ts

@@ -0,0 +1,14 @@
+import { NextResponse } from 'next/server';
+import { getCurrentUser, toPublicUser } from '@/lib/auth/getCurrentUser';
+import { UnauthorizedError } from '@/lib/errors';
+import { handleApiError } from '@/lib/api/handleError';
+
+export const runtime = 'nodejs';
+
+export async function GET() {
+  const user = await getCurrentUser();
+  if (!user) {
+    return handleApiError(new UnauthorizedError());
+  }
+  return NextResponse.json({ user: toPublicUser(user) });
+}

app/api/auth/register/route.ts

@@ -0,0 +1,36 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { AuthService } from '@/services/AuthService';
+import { UserRepository } from '@/repositories/UserRepository';
+import { getDb } from '@/lib/db/sqlite';
+import { toPublicUser } from '@/lib/auth/getCurrentUser';
+import { createSessionToken, setSessionCookie } from '@/lib/auth/session';
+import { handleApiError, jsonError } from '@/lib/api/handleError';
+
+export const runtime = 'nodejs';
+
+export async function POST(request: NextRequest) {
+  let body: Record<string, unknown>;
+  try {
+    body = (await request.json()) as Record<string, unknown>;
+  } catch {
+    return jsonError(400, 'リクエスト本文が不正です');
+  }
+
+  const authService = new AuthService(new UserRepository(getDb()));
+  try {
+    const user = authService.register({
+      name: String(body.name ?? ''),
+      email: String(body.email ?? ''),
+      password: String(body.password ?? ''),
+    });
+    // 登録成功と同時にログイン(セッションCookieを設定)
+    const response = NextResponse.json(
+      { user: toPublicUser(user) },
+      { status: 201 }
+    );
+    setSessionCookie(response, createSessionToken(user.id));
+    return response;
+  } catch (error) {
+    return handleApiError(error);
+  }
+}

app/api/dashboard/route.ts

@@ -0,0 +1,19 @@
+import { NextResponse } from 'next/server';
+import { getCurrentUser } from '@/lib/auth/getCurrentUser';
+import { createDashboardService } from '@/lib/api/services';
+import { UnauthorizedError } from '@/lib/errors';
+import { handleApiError } from '@/lib/api/handleError';
+
+export const runtime = 'nodejs';
+
+export async function GET() {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+
+  const service = createDashboardService();
+  try {
+    return NextResponse.json(service.getPersonalDashboard(user.id));
+  } catch (error) {
+    return handleApiError(error);
+  }
+}

app/api/files/[fileId]/download/route.ts

@@ -0,0 +1,32 @@
+import { NextRequest, NextResponse } from 'next/server';
+import fs from 'node:fs';
+import { getCurrentUser } from '@/lib/auth/getCurrentUser';
+import { createFileStorageService } from '@/lib/api/services';
+import { UnauthorizedError } from '@/lib/errors';
+import { handleApiError } from '@/lib/api/handleError';
+
+export const runtime = 'nodejs';
+
+export async function GET(
+  _request: NextRequest,
+  { params }: { params: Promise<{ fileId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { fileId } = await params;
+
+  const service = createFileStorageService();
+  try {
+    const file = service.getFileInfo(user.id, Number(fileId));
+    const body = fs.readFileSync(file.path);
+    return new NextResponse(body, {
+      headers: {
+        'Content-Type': file.mimeType,
+        'Content-Disposition': `inline; filename="${file.originalName}"`,
+        'Content-Length': String(file.size),
+      },
+    });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}

app/api/files/[fileId]/route.ts

@@ -0,0 +1,24 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getCurrentUser } from '@/lib/auth/getCurrentUser';
+import { createFileStorageService } from '@/lib/api/services';
+import { UnauthorizedError } from '@/lib/errors';
+import { handleApiError } from '@/lib/api/handleError';
+
+export const runtime = 'nodejs';
+
+export async function DELETE(
+  _request: NextRequest,
+  { params }: { params: Promise<{ fileId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { fileId } = await params;
+
+  const service = createFileStorageService();
+  try {
+    service.delete(user.id, Number(fileId));
+    return NextResponse.json({ ok: true });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}

app/api/notifications/[id]/read/route.ts

@@ -0,0 +1,25 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getCurrentUser } from '@/lib/auth/getCurrentUser';
+import { createNotificationService } from '@/lib/api/services';
+import { UnauthorizedError, NotFoundError } from '@/lib/errors';
+import { handleApiError } from '@/lib/api/handleError';
+
+export const runtime = 'nodejs';
+
+export async function POST(
+  _request: NextRequest,
+  { params }: { params: Promise<{ id: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) {
+    return handleApiError(new UnauthorizedError());
+  }
+  const { id } = await params;
+
+  const service = createNotificationService();
+  const updated = service.markRead(Number(id), user.id);
+  if (!updated) {
+    return handleApiError(new NotFoundError('Notification', id));
+  }
+  return NextResponse.json({ ok: true });
+}

app/api/notifications/route.ts

@@ -0,0 +1,19 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getCurrentUser } from '@/lib/auth/getCurrentUser';
+import { createNotificationService } from '@/lib/api/services';
+import { UnauthorizedError } from '@/lib/errors';
+import { handleApiError } from '@/lib/api/handleError';
+
+export const runtime = 'nodejs';
+
+export async function GET(request: NextRequest) {
+  const user = await getCurrentUser();
+  if (!user) {
+    return handleApiError(new UnauthorizedError());
+  }
+
+  const page = Number(request.nextUrl.searchParams.get('page') ?? '1') || 1;
+  const service = createNotificationService();
+  const result = service.listUnread(user.id, page);
+  return NextResponse.json(result);
+}

app/api/projects/[projectId]/activity/route.ts

@@ -0,0 +1,34 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getCurrentUser } from '@/lib/auth/getCurrentUser';
+import {
+  createProjectService,
+  createActivityLogService,
+} from '@/lib/api/services';
+import { UnauthorizedError } from '@/lib/errors';
+import { handleApiError } from '@/lib/api/handleError';
+
+export const runtime = 'nodejs';
+
+export async function GET(
+  request: NextRequest,
+  { params }: { params: Promise<{ projectId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) {
+    return handleApiError(new UnauthorizedError());
+  }
+  const { projectId } = await params;
+
+  // メンバーシップ確認(非参加者は403)
+  const projectService = createProjectService();
+  try {
+    projectService.getProject(user.id, Number(projectId));
+  } catch (error) {
+    return handleApiError(error);
+  }
+
+  const page = Number(request.nextUrl.searchParams.get('page') ?? '1') || 1;
+  const activityService = createActivityLogService();
+  const result = activityService.listByProject(Number(projectId), page);
+  return NextResponse.json(result);
+}

app/api/projects/[projectId]/attachments/route.ts

@@ -0,0 +1,41 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getCurrentUser } from '@/lib/auth/getCurrentUser';
+import { createFileStorageService } from '@/lib/api/services';
+import { UnauthorizedError, ValidationError } from '@/lib/errors';
+import { handleApiError } from '@/lib/api/handleError';
+
+export const runtime = 'nodejs';
+
+/**
+ * チャット/掲示板添付用のファイルアップロード。
+ * Files一覧公開用の通知/SSE/アクティビティを行わず、source='attachment'で保存する。
+ */
+export async function POST(
+  request: NextRequest,
+  { params }: { params: Promise<{ projectId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { projectId } = await params;
+
+  const formData = await request.formData();
+  const file = formData.get('file');
+  if (!(file instanceof File)) {
+    return handleApiError(
+      new ValidationError('ファイルを指定してください', 'file')
+    );
+  }
+
+  const data = Buffer.from(await file.arrayBuffer());
+  const service = createFileStorageService();
+  try {
+    const fileAsset = service.uploadForAttachment(user.id, Number(projectId), {
+      originalName: file.name,
+      mimeType: file.type || 'application/octet-stream',
+      data,
+    });
+    return NextResponse.json({ file: fileAsset }, { status: 201 });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}

app/api/projects/[projectId]/board/comments/[commentId]/route.ts

@@ -0,0 +1,51 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getCurrentUser } from '@/lib/auth/getCurrentUser';
+import { createBoardService } from '@/lib/api/services';
+import { UnauthorizedError } from '@/lib/errors';
+import { handleApiError, jsonError } from '@/lib/api/handleError';
+
+export const runtime = 'nodejs';
+
+export async function PATCH(
+  request: NextRequest,
+  { params }: { params: Promise<{ projectId: string; commentId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { commentId } = await params;
+  let body: Record<string, unknown>;
+  try {
+    body = (await request.json()) as Record<string, unknown>;
+  } catch {
+    return jsonError(400, 'リクエスト本文が不正です');
+  }
+
+  const service = createBoardService();
+  try {
+    const comment = service.updateComment(
+      user.id,
+      Number(commentId),
+      String(body.bodyMd ?? '')
+    );
+    return NextResponse.json({ comment });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}
+
+export async function DELETE(
+  _request: NextRequest,
+  { params }: { params: Promise<{ projectId: string; commentId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { commentId } = await params;
+
+  const service = createBoardService();
+  try {
+    service.deleteComment(user.id, Number(commentId));
+    return NextResponse.json({ ok: true });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}

app/api/projects/[projectId]/board/threads/[threadId]/comments/route.ts

@@ -0,0 +1,40 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getCurrentUser } from '@/lib/auth/getCurrentUser';
+import { createBoardService } from '@/lib/api/services';
+import { UnauthorizedError } from '@/lib/errors';
+import { handleApiError, jsonError } from '@/lib/api/handleError';
+
+export const runtime = 'nodejs';
+
+export async function POST(
+  request: NextRequest,
+  { params }: { params: Promise<{ projectId: string; threadId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { threadId } = await params;
+  let body: Record<string, unknown>;
+  try {
+    body = (await request.json()) as Record<string, unknown>;
+  } catch {
+    return jsonError(400, 'リクエスト本文が不正です');
+  }
+
+  const service = createBoardService();
+  try {
+    const fileIds = Array.isArray(body.fileIds)
+      ? body.fileIds
+          .map((n) => Number(n))
+          .filter((n) => Number.isFinite(n) && n > 0)
+      : [];
+    const comment = service.createComment(
+      user.id,
+      Number(threadId),
+      String(body.bodyMd ?? ''),
+      fileIds
+    );
+    return NextResponse.json({ comment }, { status: 201 });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}

app/api/projects/[projectId]/board/threads/[threadId]/route.ts

@@ -0,0 +1,75 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getCurrentUser } from '@/lib/auth/getCurrentUser';
+import { createBoardService } from '@/lib/api/services';
+import { UnauthorizedError } from '@/lib/errors';
+import { handleApiError, jsonError } from '@/lib/api/handleError';
+
+export const runtime = 'nodejs';
+
+export async function GET(
+  _request: NextRequest,
+  { params }: { params: Promise<{ projectId: string; threadId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { threadId } = await params;
+
+  const service = createBoardService();
+  try {
+    const thread = service.getThread(user.id, Number(threadId));
+    const comments = service.listComments(user.id, Number(threadId));
+    return NextResponse.json({ thread, comments });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}
+
+export async function PATCH(
+  request: NextRequest,
+  { params }: { params: Promise<{ projectId: string; threadId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { threadId } = await params;
+  let body: Record<string, unknown>;
+  try {
+    body = (await request.json()) as Record<string, unknown>;
+  } catch {
+    return jsonError(400, 'リクエスト本文が不正です');
+  }
+
+  const service = createBoardService();
+  try {
+    const thread = service.updateThread(user.id, Number(threadId), {
+      title: typeof body.title === 'string' ? body.title : undefined,
+      bodyMd: typeof body.bodyMd === 'string' ? body.bodyMd : undefined,
+      category:
+        typeof body.category === 'string'
+          ? (body.category as never)
+          : undefined,
+      isPinned: typeof body.isPinned === 'number' ? body.isPinned : undefined,
+      isImportant:
+        typeof body.isImportant === 'number' ? body.isImportant : undefined,
+    });
+    return NextResponse.json({ thread });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}
+
+export async function DELETE(
+  _request: NextRequest,
+  { params }: { params: Promise<{ projectId: string; threadId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { threadId } = await params;
+
+  const service = createBoardService();
+  try {
+    service.deleteThread(user.id, Number(threadId));
+    return NextResponse.json({ ok: true });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}

app/api/projects/[projectId]/board/threads/route.ts

@@ -0,0 +1,63 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getCurrentUser } from '@/lib/auth/getCurrentUser';
+import { createBoardService } from '@/lib/api/services';
+import { UnauthorizedError } from '@/lib/errors';
+import { handleApiError, jsonError } from '@/lib/api/handleError';
+
+export const runtime = 'nodejs';
+
+export async function GET(
+  request: NextRequest,
+  { params }: { params: Promise<{ projectId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { projectId } = await params;
+  const page = Number(request.nextUrl.searchParams.get('page') ?? '1') || 1;
+  const search = request.nextUrl.searchParams.get('q') ?? undefined;
+
+  const service = createBoardService();
+  try {
+    return NextResponse.json(
+      service.listThreads(user.id, Number(projectId), { page, search })
+    );
+  } catch (error) {
+    return handleApiError(error);
+  }
+}
+
+export async function POST(
+  request: NextRequest,
+  { params }: { params: Promise<{ projectId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { projectId } = await params;
+  let body: Record<string, unknown>;
+  try {
+    body = (await request.json()) as Record<string, unknown>;
+  } catch {
+    return jsonError(400, 'リクエスト本文が不正です');
+  }
+
+  const service = createBoardService();
+  try {
+    const fileIds = Array.isArray(body.fileIds)
+      ? body.fileIds
+          .map((n) => Number(n))
+          .filter((n) => Number.isFinite(n) && n > 0)
+      : [];
+    const thread = service.createThread(user.id, Number(projectId), {
+      title: String(body.title ?? ''),
+      bodyMd: String(body.bodyMd ?? ''),
+      category:
+        typeof body.category === 'string'
+          ? (body.category as never)
+          : undefined,
+      fileIds,
+    });
+    return NextResponse.json({ thread }, { status: 201 });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}

app/api/projects/[projectId]/calendar/events/[eventId]/route.ts

@@ -0,0 +1,56 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getCurrentUser } from '@/lib/auth/getCurrentUser';
+import { createScheduleService } from '@/lib/api/services';
+import { UnauthorizedError } from '@/lib/errors';
+import { handleApiError, jsonError } from '@/lib/api/handleError';
+
+export const runtime = 'nodejs';
+
+export async function PATCH(
+  request: NextRequest,
+  { params }: { params: Promise<{ projectId: string; eventId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { eventId } = await params;
+  let body: Record<string, unknown>;
+  try {
+    body = (await request.json()) as Record<string, unknown>;
+  } catch {
+    return jsonError(400, 'リクエスト本文が不正です');
+  }
+  const service = createScheduleService();
+  try {
+    const event = service.updateEvent(user.id, Number(eventId), {
+      title: typeof body.title === 'string' ? body.title : undefined,
+      description:
+        typeof body.description === 'string' ? body.description : undefined,
+      startAt: typeof body.startAt === 'string' ? body.startAt : undefined,
+      endAt:
+        typeof body.endAt === 'string'
+          ? body.endAt
+          : body.endAt === null
+            ? null
+            : undefined,
+    });
+    return NextResponse.json({ event });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}
+
+export async function DELETE(
+  _request: NextRequest,
+  { params }: { params: Promise<{ projectId: string; eventId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { eventId } = await params;
+  const service = createScheduleService();
+  try {
+    service.deleteEvent(user.id, Number(eventId));
+    return NextResponse.json({ ok: true });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}

app/api/projects/[projectId]/calendar/events/route.ts

@@ -0,0 +1,56 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getCurrentUser } from '@/lib/auth/getCurrentUser';
+import { createScheduleService } from '@/lib/api/services';
+import { UnauthorizedError } from '@/lib/errors';
+import { handleApiError, jsonError } from '@/lib/api/handleError';
+
+export const runtime = 'nodejs';
+
+export async function GET(
+  request: NextRequest,
+  { params }: { params: Promise<{ projectId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { projectId } = await params;
+  const from = request.nextUrl.searchParams.get('from') ?? '';
+  const to = request.nextUrl.searchParams.get('to') ?? '';
+  const service = createScheduleService();
+  try {
+    return NextResponse.json(
+      service.getCalendarEvents(user.id, Number(projectId), { from, to })
+    );
+  } catch (error) {
+    return handleApiError(error);
+  }
+}
+
+export async function POST(
+  request: NextRequest,
+  { params }: { params: Promise<{ projectId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { projectId } = await params;
+  let body: Record<string, unknown>;
+  try {
+    body = (await request.json()) as Record<string, unknown>;
+  } catch {
+    return jsonError(400, 'リクエスト本文が不正です');
+  }
+  const service = createScheduleService();
+  try {
+    const event = service.createEvent(user.id, {
+      projectId: Number(projectId),
+      title: String(body.title ?? ''),
+      type: (typeof body.type === 'string' ? body.type : 'custom') as never,
+      startAt: String(body.startAt ?? ''),
+      endAt: typeof body.endAt === 'string' ? body.endAt : null,
+      description:
+        typeof body.description === 'string' ? body.description : null,
+    });
+    return NextResponse.json({ event }, { status: 201 });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}

app/api/projects/[projectId]/chat/messages/[messageId]/route.ts

@@ -0,0 +1,51 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getCurrentUser } from '@/lib/auth/getCurrentUser';
+import { createChatService } from '@/lib/api/services';
+import { UnauthorizedError } from '@/lib/errors';
+import { handleApiError, jsonError } from '@/lib/api/handleError';
+
+export const runtime = 'nodejs';
+
+export async function PATCH(
+  request: NextRequest,
+  { params }: { params: Promise<{ projectId: string; messageId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { messageId } = await params;
+  let body: Record<string, unknown>;
+  try {
+    body = (await request.json()) as Record<string, unknown>;
+  } catch {
+    return jsonError(400, 'リクエスト本文が不正です');
+  }
+
+  const service = createChatService();
+  try {
+    const message = service.editMessage(
+      user.id,
+      Number(messageId),
+      String(body.body ?? '')
+    );
+    return NextResponse.json({ message });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}
+
+export async function DELETE(
+  _request: NextRequest,
+  { params }: { params: Promise<{ projectId: string; messageId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { messageId } = await params;
+
+  const service = createChatService();
+  try {
+    service.deleteMessage(user.id, Number(messageId));
+    return NextResponse.json({ ok: true });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}

app/api/projects/[projectId]/chat/messages/route.ts

@@ -0,0 +1,60 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getCurrentUser } from '@/lib/auth/getCurrentUser';
+import { createChatService } from '@/lib/api/services';
+import { UnauthorizedError } from '@/lib/errors';
+import { handleApiError, jsonError } from '@/lib/api/handleError';
+
+export const runtime = 'nodejs';
+
+export async function GET(
+  request: NextRequest,
+  { params }: { params: Promise<{ projectId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { projectId } = await params;
+  const page = Number(request.nextUrl.searchParams.get('page') ?? '1') || 1;
+  const search = request.nextUrl.searchParams.get('q') ?? undefined;
+
+  const service = createChatService();
+  try {
+    return NextResponse.json(
+      service.getHistory(user.id, Number(projectId), { page, search })
+    );
+  } catch (error) {
+    return handleApiError(error);
+  }
+}
+
+export async function POST(
+  request: NextRequest,
+  { params }: { params: Promise<{ projectId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { projectId } = await params;
+  let body: Record<string, unknown>;
+  try {
+    body = (await request.json()) as Record<string, unknown>;
+  } catch {
+    return jsonError(400, 'リクエスト本文が不正です');
+  }
+
+  const service = createChatService();
+  try {
+    const fileIds = Array.isArray(body.fileIds)
+      ? body.fileIds
+          .map((n) => Number(n))
+          .filter((n) => Number.isFinite(n) && n > 0)
+      : [];
+    const message = service.sendMessage(
+      user.id,
+      Number(projectId),
+      String(body.body ?? ''),
+      fileIds
+    );
+    return NextResponse.json({ message }, { status: 201 });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}

app/api/projects/[projectId]/chat/stream/route.ts

@@ -0,0 +1,70 @@
+import { NextRequest } from 'next/server';
+import { getCurrentUser } from '@/lib/auth/getCurrentUser';
+import { createProjectService } from '@/lib/api/services';
+import { getSseHub } from '@/lib/sse/hub';
+import { UnauthorizedError } from '@/lib/errors';
+import { handleApiError } from '@/lib/api/handleError';
+
+export const runtime = 'nodejs';
+
+export async function GET(
+  request: NextRequest,
+  { params }: { params: Promise<{ projectId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { projectId } = await params;
+
+  const projectService = createProjectService();
+  try {
+    projectService.getProject(user.id, Number(projectId));
+  } catch (error) {
+    return handleApiError(error);
+  }
+
+  const pid = Number(projectId);
+  const hub = getSseHub();
+  const encoder = new TextEncoder();
+
+  const stream = new ReadableStream<Uint8Array>({
+    start(controller) {
+      const client = {
+        enqueue: (chunk: string) => controller.enqueue(encoder.encode(chunk)),
+        close: () => {
+          try {
+            controller.close();
+          } catch {
+            // 既に閉じられている
+          }
+        },
+      };
+      hub.addClient(pid, client);
+
+      const heartbeat = setInterval(() => {
+        try {
+          controller.enqueue(encoder.encode(': ping\n\n'));
+        } catch {
+          clearInterval(heartbeat);
+        }
+      }, 30_000);
+
+      request.signal.addEventListener('abort', () => {
+        clearInterval(heartbeat);
+        hub.removeClient(pid, client);
+        try {
+          controller.close();
+        } catch {
+          // 既に閉じられている
+        }
+      });
+    },
+  });
+
+  return new Response(stream, {
+    headers: {
+      'Content-Type': 'text/event-stream',
+      'Cache-Control': 'no-cache, no-transform',
+      Connection: 'keep-alive',
+    },
+  });
+}

app/api/projects/[projectId]/files/route.ts

@@ -0,0 +1,55 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getCurrentUser } from '@/lib/auth/getCurrentUser';
+import { createFileStorageService } from '@/lib/api/services';
+import { UnauthorizedError, ValidationError } from '@/lib/errors';
+import { handleApiError } from '@/lib/api/handleError';
+
+export const runtime = 'nodejs';
+
+export async function GET(
+  request: NextRequest,
+  { params }: { params: Promise<{ projectId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { projectId } = await params;
+  const page = Number(request.nextUrl.searchParams.get('page') ?? '1') || 1;
+  const service = createFileStorageService();
+  try {
+    return NextResponse.json(
+      service.listFiles(user.id, Number(projectId), page)
+    );
+  } catch (error) {
+    return handleApiError(error);
+  }
+}
+
+export async function POST(
+  request: NextRequest,
+  { params }: { params: Promise<{ projectId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { projectId } = await params;
+
+  const formData = await request.formData();
+  const file = formData.get('file');
+  if (!(file instanceof File)) {
+    return handleApiError(
+      new ValidationError('ファイルを指定してください', 'file')
+    );
+  }
+
+  const data = Buffer.from(await file.arrayBuffer());
+  const service = createFileStorageService();
+  try {
+    const fileAsset = service.upload(user.id, Number(projectId), {
+      originalName: file.name,
+      mimeType: file.type || 'application/octet-stream',
+      data,
+    });
+    return NextResponse.json({ file: fileAsset }, { status: 201 });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}

app/api/projects/[projectId]/meetings/[id]/route.ts

@@ -0,0 +1,75 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getCurrentUser } from '@/lib/auth/getCurrentUser';
+import { createMeetingService } from '@/lib/api/services';
+import { UnauthorizedError } from '@/lib/errors';
+import { handleApiError, jsonError } from '@/lib/api/handleError';
+
+export const runtime = 'nodejs';
+
+export async function PATCH(
+  request: NextRequest,
+  { params }: { params: Promise<{ projectId: string; id: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { id } = await params;
+  let body: Record<string, unknown>;
+  try {
+    body = (await request.json()) as Record<string, unknown>;
+  } catch {
+    return jsonError(400, 'リクエスト本文が不正です');
+  }
+  const service = createMeetingService();
+  try {
+    if (body.minutesMd !== undefined) {
+      const meeting = service.updateMinutes(
+        user.id,
+        Number(id),
+        String(body.minutesMd ?? '')
+      );
+      return NextResponse.json({ meeting });
+    }
+    const meeting = service.updateMeeting(user.id, Number(id), {
+      title: typeof body.title === 'string' ? body.title : undefined,
+      startAt: typeof body.startAt === 'string' ? body.startAt : undefined,
+      endAt: typeof body.endAt === 'string' ? body.endAt : undefined,
+      agendaMd: typeof body.agendaMd === 'string' ? body.agendaMd : undefined,
+      description:
+        typeof body.description === 'string' ? body.description : undefined,
+    });
+    return NextResponse.json({ meeting });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}
+
+export async function POST(
+  request: NextRequest,
+  { params }: { params: Promise<{ projectId: string; id: string }> }
+) {
+  // /api/projects/:projectId/meetings/check は専用ルートで処理するが、
+  // ここでは meetingId='check' の場合は重複チェックのみを行う
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { projectId, id } = await params;
+  let body: Record<string, unknown>;
+  try {
+    body = (await request.json()) as Record<string, unknown>;
+  } catch {
+    return jsonError(400, 'リクエスト本文が不正です');
+  }
+  const service = createMeetingService();
+  try {
+    const conflicts = service.checkScheduleConflicts(
+      user.id,
+      Number(projectId),
+      Array.isArray(body.memberIds) ? body.memberIds.map(Number) : [],
+      String(body.startAt ?? ''),
+      String(body.endAt ?? ''),
+      id === 'check' ? undefined : Number(id)
+    );
+    return NextResponse.json({ conflicts });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}

app/api/projects/[projectId]/meetings/route.ts

@@ -0,0 +1,58 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getCurrentUser } from '@/lib/auth/getCurrentUser';
+import { createMeetingService } from '@/lib/api/services';
+import { UnauthorizedError } from '@/lib/errors';
+import { handleApiError, jsonError } from '@/lib/api/handleError';
+
+export const runtime = 'nodejs';
+
+export async function GET(
+  _request: NextRequest,
+  { params }: { params: Promise<{ projectId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { projectId } = await params;
+  const service = createMeetingService();
+  try {
+    return NextResponse.json({
+      meetings: service.getMeetings(user.id, Number(projectId)),
+    });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}
+
+export async function POST(
+  request: NextRequest,
+  { params }: { params: Promise<{ projectId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { projectId } = await params;
+  let body: Record<string, unknown>;
+  try {
+    body = (await request.json()) as Record<string, unknown>;
+  } catch {
+    return jsonError(400, 'リクエスト本文が不正です');
+  }
+  const service = createMeetingService();
+  try {
+    const result = service.createMeeting(user.id, Number(projectId), {
+      title: String(body.title ?? ''),
+      startAt: String(body.startAt ?? ''),
+      endAt: String(body.endAt ?? ''),
+      description:
+        typeof body.description === 'string' ? body.description : null,
+      location: typeof body.location === 'string' ? body.location : null,
+      meetingUrl: typeof body.meetingUrl === 'string' ? body.meetingUrl : null,
+      agendaMd: typeof body.agendaMd === 'string' ? body.agendaMd : null,
+      memberIds: Array.isArray(body.memberIds)
+        ? body.memberIds.map(Number)
+        : [],
+    });
+    return NextResponse.json(result, { status: 201 });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}

app/api/projects/[projectId]/members/[userId]/route.ts

@@ -0,0 +1,30 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getCurrentUser } from '@/lib/auth/getCurrentUser';
+import { createProjectService } from '@/lib/api/services';
+import { UnauthorizedError } from '@/lib/errors';
+import { handleApiError } from '@/lib/api/handleError';
+
+export const runtime = 'nodejs';
+
+export async function DELETE(
+  _request: NextRequest,
+  {
+    params,
+  }: {
+    params: Promise<{ projectId: string; userId: string }>;
+  }
+) {
+  const user = await getCurrentUser();
+  if (!user) {
+    return handleApiError(new UnauthorizedError());
+  }
+  const { projectId, userId } = await params;
+
+  const service = createProjectService();
+  try {
+    service.removeMember(user.id, Number(projectId), Number(userId));
+    return NextResponse.json({ ok: true });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}

app/api/projects/[projectId]/members/route.ts

@@ -0,0 +1,69 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getCurrentUser } from '@/lib/auth/getCurrentUser';
+import { createProjectService, createUserRepository } from '@/lib/api/services';
+import { validateProjectMemberRole } from '@/lib/validators/projectValidator';
+import { UnauthorizedError, NotFoundError } from '@/lib/errors';
+import { handleApiError, jsonError } from '@/lib/api/handleError';
+
+export const runtime = 'nodejs';
+
+export async function GET(
+  _request: NextRequest,
+  { params }: { params: Promise<{ projectId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) {
+    return handleApiError(new UnauthorizedError());
+  }
+  const { projectId } = await params;
+
+  const service = createProjectService();
+  try {
+    const members = service.getMembers(user.id, Number(projectId));
+    return NextResponse.json({ members });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}
+
+export async function POST(
+  request: NextRequest,
+  { params }: { params: Promise<{ projectId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) {
+    return handleApiError(new UnauthorizedError());
+  }
+  const { projectId } = await params;
+
+  let body: Record<string, unknown>;
+  try {
+    body = (await request.json()) as Record<string, unknown>;
+  } catch {
+    return jsonError(400, 'リクエスト本文が不正です');
+  }
+
+  const email = String(body.email ?? '');
+  const role = validateProjectMemberRole(
+    typeof body.role === 'string' ? body.role : 'member'
+  );
+
+  // メールアドレスからユーザーを解決する
+  const targetUser = createUserRepository().findByEmail(email);
+  if (!targetUser) {
+    return handleApiError(new NotFoundError('User', email));
+  }
+
+  const service = createProjectService();
+  try {
+    const member = service.addMember(
+      user.id,
+      Number(projectId),
+      targetUser.id,
+      role
+    );
+    return NextResponse.json({ member }, { status: 201 });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}

app/api/projects/[projectId]/milestones/[id]/route.ts

@@ -0,0 +1,60 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getCurrentUser } from '@/lib/auth/getCurrentUser';
+import { createScheduleService } from '@/lib/api/services';
+import { UnauthorizedError } from '@/lib/errors';
+import { handleApiError, jsonError } from '@/lib/api/handleError';
+
+export const runtime = 'nodejs';
+
+export async function PATCH(
+  request: NextRequest,
+  { params }: { params: Promise<{ projectId: string; id: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { id } = await params;
+  let body: Record<string, unknown>;
+  try {
+    body = (await request.json()) as Record<string, unknown>;
+  } catch {
+    return jsonError(400, 'リクエスト本文が不正です');
+  }
+  const service = createScheduleService();
+  try {
+    const milestone = service.updateMilestone(user.id, Number(id), {
+      title: typeof body.title === 'string' ? body.title : undefined,
+      dueDate:
+        typeof body.dueDate === 'string'
+          ? body.dueDate
+          : body.dueDate === null
+            ? null
+            : undefined,
+      status:
+        typeof body.status === 'string'
+          ? (body.status as 'open' | 'closed')
+          : undefined,
+      description:
+        typeof body.description === 'string' ? body.description : undefined,
+    });
+    return NextResponse.json({ milestone });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}
+
+export async function GET(
+  _request: NextRequest,
+  { params }: { params: Promise<{ projectId: string; id: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { id } = await params;
+  const service = createScheduleService();
+  try {
+    return NextResponse.json({
+      progress: service.getMilestoneProgress(user.id, Number(id)),
+    });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}

app/api/projects/[projectId]/milestones/route.ts

@@ -0,0 +1,51 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getCurrentUser } from '@/lib/auth/getCurrentUser';
+import { createScheduleService } from '@/lib/api/services';
+import { UnauthorizedError } from '@/lib/errors';
+import { handleApiError, jsonError } from '@/lib/api/handleError';
+
+export const runtime = 'nodejs';
+
+export async function GET(
+  _request: NextRequest,
+  { params }: { params: Promise<{ projectId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { projectId } = await params;
+  const service = createScheduleService();
+  try {
+    return NextResponse.json({
+      milestones: service.getMilestones(user.id, Number(projectId)),
+    });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}
+
+export async function POST(
+  request: NextRequest,
+  { params }: { params: Promise<{ projectId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { projectId } = await params;
+  let body: Record<string, unknown>;
+  try {
+    body = (await request.json()) as Record<string, unknown>;
+  } catch {
+    return jsonError(400, 'リクエスト本文が不正です');
+  }
+  const service = createScheduleService();
+  try {
+    const milestone = service.createMilestone(user.id, Number(projectId), {
+      title: String(body.title ?? ''),
+      dueDate: typeof body.dueDate === 'string' ? body.dueDate : null,
+      description:
+        typeof body.description === 'string' ? body.description : null,
+    });
+    return NextResponse.json({ milestone }, { status: 201 });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}

app/api/projects/[projectId]/notes/[noteId]/route.ts

@@ -0,0 +1,69 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getCurrentUser } from '@/lib/auth/getCurrentUser';
+import { createNoteService } from '@/lib/api/services';
+import { UnauthorizedError } from '@/lib/errors';
+import { handleApiError, jsonError } from '@/lib/api/handleError';
+
+export const runtime = 'nodejs';
+
+export async function GET(
+  _request: NextRequest,
+  { params }: { params: Promise<{ projectId: string; noteId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { noteId } = await params;
+
+  const service = createNoteService();
+  try {
+    const note = service.getNote(user.id, Number(noteId));
+    return NextResponse.json({ note });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}
+
+export async function PATCH(
+  request: NextRequest,
+  { params }: { params: Promise<{ projectId: string; noteId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { noteId } = await params;
+  let body: Record<string, unknown>;
+  try {
+    body = (await request.json()) as Record<string, unknown>;
+  } catch {
+    return jsonError(400, 'リクエスト本文が不正です');
+  }
+
+  const service = createNoteService();
+  try {
+    const note = service.updateNote(user.id, Number(noteId), {
+      title: typeof body.title === 'string' ? body.title : undefined,
+      bodyMd: typeof body.bodyMd === 'string' ? body.bodyMd : undefined,
+      tags: typeof body.tags === 'string' ? body.tags : undefined,
+      isPinned: typeof body.isPinned === 'number' ? body.isPinned : undefined,
+    });
+    return NextResponse.json({ note });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}
+
+export async function DELETE(
+  _request: NextRequest,
+  { params }: { params: Promise<{ projectId: string; noteId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { noteId } = await params;
+
+  const service = createNoteService();
+  try {
+    service.deleteNote(user.id, Number(noteId));
+    return NextResponse.json({ ok: true });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}

app/api/projects/[projectId]/notes/route.ts

@@ -0,0 +1,54 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getCurrentUser } from '@/lib/auth/getCurrentUser';
+import { createNoteService } from '@/lib/api/services';
+import { UnauthorizedError } from '@/lib/errors';
+import { handleApiError, jsonError } from '@/lib/api/handleError';
+
+export const runtime = 'nodejs';
+
+export async function GET(
+  request: NextRequest,
+  { params }: { params: Promise<{ projectId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { projectId } = await params;
+  const page = Number(request.nextUrl.searchParams.get('page') ?? '1') || 1;
+  const search = request.nextUrl.searchParams.get('q') ?? undefined;
+
+  const service = createNoteService();
+  try {
+    return NextResponse.json(
+      service.listNotes(user.id, Number(projectId), { page, search })
+    );
+  } catch (error) {
+    return handleApiError(error);
+  }
+}
+
+export async function POST(
+  request: NextRequest,
+  { params }: { params: Promise<{ projectId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { projectId } = await params;
+  let body: Record<string, unknown>;
+  try {
+    body = (await request.json()) as Record<string, unknown>;
+  } catch {
+    return jsonError(400, 'リクエスト本文が不正です');
+  }
+
+  const service = createNoteService();
+  try {
+    const note = service.createNote(user.id, Number(projectId), {
+      title: String(body.title ?? ''),
+      bodyMd: String(body.bodyMd ?? ''),
+      tags: typeof body.tags === 'string' ? body.tags : undefined,
+    });
+    return NextResponse.json({ note }, { status: 201 });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}

app/api/projects/[projectId]/route.ts

@@ -0,0 +1,79 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getCurrentUser } from '@/lib/auth/getCurrentUser';
+import { createProjectService } from '@/lib/api/services';
+import { UnauthorizedError } from '@/lib/errors';
+import { handleApiError, jsonError } from '@/lib/api/handleError';
+
+export const runtime = 'nodejs';
+
+export async function GET(
+  _request: NextRequest,
+  { params }: { params: Promise<{ projectId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) {
+    return handleApiError(new UnauthorizedError());
+  }
+  const { projectId } = await params;
+
+  const service = createProjectService();
+  try {
+    const dashboard = service.getDashboard(user.id, Number(projectId));
+    return NextResponse.json(dashboard);
+  } catch (error) {
+    return handleApiError(error);
+  }
+}
+
+export async function PATCH(
+  request: NextRequest,
+  { params }: { params: Promise<{ projectId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) {
+    return handleApiError(new UnauthorizedError());
+  }
+  const { projectId } = await params;
+
+  let body: Record<string, unknown>;
+  try {
+    body = (await request.json()) as Record<string, unknown>;
+  } catch {
+    return jsonError(400, 'リクエスト本文が不正です');
+  }
+
+  const service = createProjectService();
+  try {
+    const project = service.updateProject(user.id, Number(projectId), {
+      name: typeof body.name === 'string' ? body.name : undefined,
+      description:
+        typeof body.description === 'string' ? body.description : undefined,
+      status:
+        typeof body.status === 'string'
+          ? (body.status as 'active' | 'on_hold' | 'completed' | 'archived')
+          : undefined,
+    });
+    return NextResponse.json({ project });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}
+
+export async function DELETE(
+  _request: NextRequest,
+  { params }: { params: Promise<{ projectId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) {
+    return handleApiError(new UnauthorizedError());
+  }
+  const { projectId } = await params;
+
+  const service = createProjectService();
+  try {
+    service.deleteProject(user.id, Number(projectId));
+    return NextResponse.json({ ok: true });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}

app/api/projects/[projectId]/search/route.ts

@@ -0,0 +1,32 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getCurrentUser } from '@/lib/auth/getCurrentUser';
+import { createSearchService } from '@/lib/api/services';
+import { UnauthorizedError } from '@/lib/errors';
+import { handleApiError } from '@/lib/api/handleError';
+
+export const runtime = 'nodejs';
+
+export async function GET(
+  request: NextRequest,
+  { params }: { params: Promise<{ projectId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { projectId } = await params;
+  const q = request.nextUrl.searchParams.get('q') ?? '';
+  const type = (request.nextUrl.searchParams.get('type') ?? undefined) as
+    | string
+    | undefined;
+
+  const service = createSearchService();
+  try {
+    return NextResponse.json(
+      service.search(user.id, Number(projectId), {
+        q,
+        type: type as never,
+      })
+    );
+  } catch (error) {
+    return handleApiError(error);
+  }
+}

app/api/projects/[projectId]/todos/columns/[columnId]/route.ts

@@ -0,0 +1,49 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getCurrentUser } from '@/lib/auth/getCurrentUser';
+import { createTodoService } from '@/lib/api/services';
+import { UnauthorizedError } from '@/lib/errors';
+import { handleApiError, jsonError } from '@/lib/api/handleError';
+
+export const runtime = 'nodejs';
+
+export async function PATCH(
+  request: NextRequest,
+  { params }: { params: Promise<{ projectId: string; columnId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { columnId } = await params;
+  let body: Record<string, unknown>;
+  try {
+    body = (await request.json()) as Record<string, unknown>;
+  } catch {
+    return jsonError(400, 'リクエスト本文が不正です');
+  }
+  const service = createTodoService();
+  try {
+    const column = service.updateColumn(user.id, Number(columnId), {
+      name: typeof body.name === 'string' ? body.name : undefined,
+      orderIndex:
+        typeof body.orderIndex === 'number' ? body.orderIndex : undefined,
+    });
+    return NextResponse.json({ column });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}
+
+export async function DELETE(
+  _request: NextRequest,
+  { params }: { params: Promise<{ projectId: string; columnId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { columnId } = await params;
+  const service = createTodoService();
+  try {
+    service.deleteColumn(user.id, Number(columnId));
+    return NextResponse.json({ ok: true });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}

app/api/projects/[projectId]/todos/columns/route.ts

@@ -0,0 +1,51 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getCurrentUser } from '@/lib/auth/getCurrentUser';
+import { createTodoService } from '@/lib/api/services';
+import { UnauthorizedError } from '@/lib/errors';
+import { handleApiError, jsonError } from '@/lib/api/handleError';
+
+export const runtime = 'nodejs';
+
+export async function GET(
+  _request: NextRequest,
+  { params }: { params: Promise<{ projectId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { projectId } = await params;
+  const service = createTodoService();
+  try {
+    return NextResponse.json({
+      columns: service.getColumns(user.id, Number(projectId)),
+    });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}
+
+export async function POST(
+  request: NextRequest,
+  { params }: { params: Promise<{ projectId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { projectId } = await params;
+  let body: Record<string, unknown>;
+  try {
+    body = (await request.json()) as Record<string, unknown>;
+  } catch {
+    return jsonError(400, 'リクエスト本文が不正です');
+  }
+  const service = createTodoService();
+  try {
+    const column = service.createColumn(
+      user.id,
+      Number(projectId),
+      String(body.name ?? ''),
+      typeof body.orderIndex === 'number' ? body.orderIndex : undefined
+    );
+    return NextResponse.json({ column }, { status: 201 });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}

app/api/projects/[projectId]/todos/items/[itemId]/route.ts

@@ -0,0 +1,99 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getCurrentUser } from '@/lib/auth/getCurrentUser';
+import { createTodoService } from '@/lib/api/services';
+import { UnauthorizedError } from '@/lib/errors';
+import { handleApiError, jsonError } from '@/lib/api/handleError';
+
+export const runtime = 'nodejs';
+
+export async function GET(
+  _request: NextRequest,
+  { params }: { params: Promise<{ projectId: string; itemId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { itemId } = await params;
+  const service = createTodoService();
+  try {
+    const item = service.getItem(user.id, Number(itemId));
+    const attachments = service.getItemAttachments(user.id, Number(itemId));
+    return NextResponse.json({ item, attachments });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}
+
+export async function PATCH(
+  request: NextRequest,
+  { params }: { params: Promise<{ projectId: string; itemId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { itemId } = await params;
+  let body: Record<string, unknown>;
+  try {
+    body = (await request.json()) as Record<string, unknown>;
+  } catch {
+    return jsonError(400, 'リクエスト本文が不正です');
+  }
+  const service = createTodoService();
+  try {
+    // complete は専用フラグでトグル、それ以外は通常更新
+    if (body.toggleComplete === true) {
+      const item = service.toggleComplete(user.id, Number(itemId));
+      return NextResponse.json({ item });
+    }
+    if (body.columnId !== undefined && body.orderIndex !== undefined) {
+      const item = service.moveItem(
+        user.id,
+        Number(itemId),
+        Number(body.columnId),
+        Number(body.orderIndex)
+      );
+      return NextResponse.json({ item });
+    }
+    // nullable フィールドは absent(undefined=更新しない) と null(クリア) を区別する
+    const nullableString = (v: unknown): string | null | undefined =>
+      v === undefined ? undefined : v === null ? null : String(v);
+    const nullableNumber = (v: unknown): number | null | undefined =>
+      v === undefined ? undefined : v === null ? null : Number(v);
+
+    const item = service.updateItem(user.id, Number(itemId), {
+      title: typeof body.title === 'string' ? body.title : undefined,
+      description: nullableString(body.description),
+      assigneeId: nullableNumber(body.assigneeId),
+      priority:
+        typeof body.priority === 'string'
+          ? (body.priority as 'low' | 'normal' | 'high')
+          : undefined,
+      startDate: nullableString(body.startDate),
+      dueDate: nullableString(body.dueDate),
+      tags: nullableString(body.tags),
+      milestoneId: nullableNumber(body.milestoneId),
+      fileIds: Array.isArray(body.fileIds)
+        ? body.fileIds
+            .map((n) => Number(n))
+            .filter((n) => Number.isFinite(n) && n > 0)
+        : undefined,
+    });
+    return NextResponse.json({ item });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}
+
+export async function DELETE(
+  _request: NextRequest,
+  { params }: { params: Promise<{ projectId: string; itemId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { itemId } = await params;
+  const service = createTodoService();
+  try {
+    service.deleteItem(user.id, Number(itemId));
+    return NextResponse.json({ ok: true });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}

app/api/projects/[projectId]/todos/items/reorder/route.ts

@@ -0,0 +1,46 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getCurrentUser } from '@/lib/auth/getCurrentUser';
+import { createTodoService } from '@/lib/api/services';
+import { UnauthorizedError } from '@/lib/errors';
+import { handleApiError, jsonError } from '@/lib/api/handleError';
+
+export const runtime = 'nodejs';
+
+/**
+ * カラム内のアイテム順序を一括再採番する(同一カラムの並べ替え / 他カラムからの移動)。
+ * body: { columnId: number, itemIds: number[] } —— itemIds の順序で orderIndex 0..n-1 を割り当てる。
+ */
+export async function POST(
+  request: NextRequest,
+  { params }: { params: Promise<{ projectId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { projectId } = await params;
+  let body: Record<string, unknown>;
+  try {
+    body = (await request.json()) as Record<string, unknown>;
+  } catch {
+    return jsonError(400, 'リクエスト本文が不正です');
+  }
+
+  const columnId = Number(body.columnId);
+  const itemIds = Array.isArray(body.itemIds)
+    ? body.itemIds
+        .map((n) => Number(n))
+        .filter((n) => Number.isFinite(n) && n > 0)
+    : [];
+
+  const service = createTodoService();
+  try {
+    const items = service.reorderItems(
+      user.id,
+      Number(projectId),
+      columnId,
+      itemIds
+    );
+    return NextResponse.json({ items });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}

app/api/projects/[projectId]/todos/items/route.ts

@@ -0,0 +1,69 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getCurrentUser } from '@/lib/auth/getCurrentUser';
+import { createTodoService } from '@/lib/api/services';
+import { UnauthorizedError } from '@/lib/errors';
+import { handleApiError, jsonError } from '@/lib/api/handleError';
+
+export const runtime = 'nodejs';
+
+export async function GET(
+  _request: NextRequest,
+  { params }: { params: Promise<{ projectId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { projectId } = await params;
+  const service = createTodoService();
+  try {
+    return NextResponse.json({
+      items: service.getItems(user.id, Number(projectId)),
+    });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}
+
+export async function POST(
+  request: NextRequest,
+  { params }: { params: Promise<{ projectId: string }> }
+) {
+  const user = await getCurrentUser();
+  if (!user) return handleApiError(new UnauthorizedError());
+  const { projectId } = await params;
+  let body: Record<string, unknown>;
+  try {
+    body = (await request.json()) as Record<string, unknown>;
+  } catch {
+    return jsonError(400, 'リクエスト本文が不正です');
+  }
+  const service = createTodoService();
+  try {
+    const fileIds = Array.isArray(body.fileIds)
+      ? body.fileIds
+          .map((n) => Number(n))
+          .filter((n) => Number.isFinite(n) && n > 0)
+      : [];
+    const item = service.createItem(user.id, Number(projectId), {
+      title: String(body.title ?? ''),
+      columnId: Number(body.columnId ?? 0),
+      description:
+        typeof body.description === 'string' ? body.description : undefined,
+      assigneeId:
+        body.assigneeId === null || body.assigneeId === undefined
+          ? null
+          : Number(body.assigneeId),
+      priority:
+        typeof body.priority === 'string'
+          ? (body.priority as 'low' | 'normal' | 'high')
+          : undefined,
+      startDate:
+        typeof body.startDate === 'string' ? body.startDate : undefined,
+      dueDate: typeof body.dueDate === 'string' ? body.dueDate : null,
+      tags: typeof body.tags === 'string' ? body.tags : undefined,
+      fileIds,
+    });
+    return NextResponse.json({ item }, { status: 201 });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}

app/api/projects/route.ts

@@ -0,0 +1,43 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getCurrentUser } from '@/lib/auth/getCurrentUser';
+import { createProjectService } from '@/lib/api/services';
+import { UnauthorizedError } from '@/lib/errors';
+import { handleApiError, jsonError } from '@/lib/api/handleError';
+
+export const runtime = 'nodejs';
+
+export async function GET() {
+  const user = await getCurrentUser();
+  if (!user) {
+    return handleApiError(new UnauthorizedError());
+  }
+  const service = createProjectService();
+  const projects = service.getMyProjects(user.id);
+  return NextResponse.json({ projects });
+}
+
+export async function POST(request: NextRequest) {
+  const user = await getCurrentUser();
+  if (!user) {
+    return handleApiError(new UnauthorizedError());
+  }
+
+  let body: Record<string, unknown>;
+  try {
+    body = (await request.json()) as Record<string, unknown>;
+  } catch {
+    return jsonError(400, 'リクエスト本文が不正です');
+  }
+
+  const service = createProjectService();
+  try {
+    const project = service.createProject(user.id, {
+      name: String(body.name ?? ''),
+      description:
+        typeof body.description === 'string' ? body.description : undefined,
+    });
+    return NextResponse.json({ project }, { status: 201 });
+  } catch (error) {
+    return handleApiError(error);
+  }
+}

app/api/users/me/route.ts

@@ -0,0 +1,54 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { AuthService } from '@/services/AuthService';
+import { UserRepository } from '@/repositories/UserRepository';
+import { getDb } from '@/lib/db/sqlite';
+import { getCurrentUser, toPublicUser } from '@/lib/auth/getCurrentUser';
+import { UnauthorizedError } from '@/lib/errors';
+import { handleApiError, jsonError } from '@/lib/api/handleError';
+import type { Locale, Theme } from '@/lib/types';
+import { PREF_MAX_AGE } from '@/lib/i18n/constants';
+
+export const runtime = 'nodejs';
+
+export async function PATCH(request: NextRequest) {
+  const currentUser = await getCurrentUser();
+  if (!currentUser) {
+    return handleApiError(new UnauthorizedError());
+  }
+
+  let body: Record<string, unknown>;
+  try {
+    body = (await request.json()) as Record<string, unknown>;
+  } catch {
+    return jsonError(400, 'リクエスト本文が不正です');
+  }
+
+  // theme/locale は生値を Service に渡し、バリデータで不正値を弾く(→ ValidationError → 400)
+  const authService = new AuthService(new UserRepository(getDb()));
+  try {
+    const updated = authService.updateProfile(currentUser.id, {
+      name: typeof body.name === 'string' ? body.name : undefined,
+      email: typeof body.email === 'string' ? body.email : undefined,
+      avatarUrl:
+        typeof body.avatarUrl === 'string' ? body.avatarUrl : undefined,
+      theme: typeof body.theme === 'string' ? (body.theme as Theme) : undefined,
+      locale:
+        typeof body.locale === 'string' ? (body.locale as Locale) : undefined,
+    });
+    const res = NextResponse.json({ user: toPublicUser(updated) });
+    // 保存結果の theme/locale をCookieに反映(SSRでレイアウトが読めるように)
+    res.cookies.set('theme', updated.theme, {
+      path: '/',
+      maxAge: PREF_MAX_AGE,
+      sameSite: 'lax',
+    });
+    res.cookies.set('locale', updated.locale, {
+      path: '/',
+      maxAge: PREF_MAX_AGE,
+      sameSite: 'lax',
+    });
+    return res;
+  } catch (error) {
+    return handleApiError(error);
+  }
+}

app/dashboard/page.tsx

@@ -0,0 +1,109 @@
+import { redirect } from 'next/navigation';
+import { getCurrentUser, toPublicUser } from '@/lib/auth/getCurrentUser';
+import { createDashboardService } from '@/lib/api/services';
+import { Header } from '@/components/layout/Header';
+import { CreateProjectForm } from '@/components/project/CreateProjectForm';
+import { DashboardWidget } from '@/components/project/DashboardWidget';
+import { getLocale, translate } from '@/lib/i18n/server';
+
+export const dynamic = 'force-dynamic';
+
+export default async function DashboardPage() {
+  const user = await getCurrentUser();
+  if (!user) {
+    redirect('/login');
+  }
+
+  const service = createDashboardService();
+  const dashboard = service.getPersonalDashboard(user.id);
+  const locale = await getLocale();
+
+  return (
+    <div className="min-h-screen bg-gray-50 dark:bg-gray-900">
+      <Header user={toPublicUser(user)} />
+      <main className="mx-auto max-w-4xl space-y-6 p-6">
+        <h1 className="text-2xl font-bold">
+          {translate('page.dashboard', locale)}
+        </h1>
+
+        <div className="grid gap-4 sm:grid-cols-2">
+          <DashboardWidget
+            title={translate('dash.projects', locale)}
+            empty={translate('dash.empty', locale)}
+          >
+            {dashboard.projects.map((p) => (
+              <a
+                key={p.id}
+                href={`/projects/${p.id}`}
+                className="block rounded border px-3 py-2 text-sm hover:bg-gray-50 dark:border-gray-700 dark:hover:bg-gray-800"
+              >
+                {p.name}（{p.status}）
+              </a>
+            ))}
+          </DashboardWidget>
+
+          <DashboardWidget
+            title={`${translate('dash.unreadNotifications', locale)} (${dashboard.unreadNotificationCount})`}
+            empty={translate('dash.noUnread', locale)}
+          >
+            <a
+              href="/notifications"
+              className="text-sm text-blue-600 hover:underline dark:text-blue-400"
+            >
+              {translate('dash.openNotifications', locale)}
+            </a>
+          </DashboardWidget>
+
+          <DashboardWidget
+            title={translate('dash.incompleteTodos', locale)}
+            empty={translate('dash.empty', locale)}
+          >
+            {dashboard.incompleteTodos.map((t) => (
+              <p key={t.id} className="text-sm">
+                {t.title}
+                {t.dueDate
+                  ? `（${translate('dash.due', locale)}: ${t.dueDate}）`
+                  : ''}
+              </p>
+            ))}
+          </DashboardWidget>
+
+          <DashboardWidget
+            title={translate('dash.overdueTasks', locale)}
+            empty={translate('dash.empty', locale)}
+          >
+            {dashboard.overdueTasks.map((t) => (
+              <p key={t.id} className="text-sm text-red-600">
+                {t.title}（{translate('dash.due', locale)}: {t.dueDate}）
+              </p>
+            ))}
+          </DashboardWidget>
+
+          <DashboardWidget
+            title={translate('dash.upcomingMeetings', locale)}
+            empty={translate('dash.empty', locale)}
+          >
+            {dashboard.upcomingMeetings.map((m) => (
+              <p key={m.id} className="text-sm">
+                {m.title}（{m.startAt}）
+              </p>
+            ))}
+          </DashboardWidget>
+
+          <DashboardWidget
+            title={translate('dash.recentActivity', locale)}
+            empty={translate('dash.empty', locale)}
+          >
+            {dashboard.recentActivity.map((l) => (
+              <p key={l.id} className="text-sm">
+                {l.action}（{l.targetType}）
+              </p>
+            ))}
+          </DashboardWidget>
+        </div>
+
+        <CreateProjectForm />
+      </main>
+    </div>
+  );
+}

app/globals.css

@@ -1,3 +1,12 @@
 @tailwind base;
 @tailwind components;
 @tailwind utilities;
+
+/* ルート要素の最低限のダーク/ライト背景フォールバック。
+   各コンポーネントは dark: ユーティリティで個別に調整している。 */
+html {
+  color-scheme: light dark;
+}
+body {
+  @apply bg-gray-50 text-gray-800 dark:bg-gray-900 dark:text-gray-100;
+}

app/layout.tsx

@@ -1,20 +1,61 @@
-import type { Metadata } from 'next';
+import type { Metadata, Viewport } from 'next';
+import { cookies } from 'next/headers';
 import './globals.css';
+import { I18nProvider } from '@/lib/i18n/I18nProvider';
+import { ServiceWorkerRegister } from '@/components/pwa/ServiceWorkerRegister';
+import type { Locale, Theme } from '@/lib/types';
 
 export const metadata: Metadata = {
-  title: 'シンプルグループウェア',
+  title: 'Groupware',
-  description:
+  description: 'Project-based team collaboration tool',
-    'プロジェクト単位で情報共有・タスク管理を行えるチームコラボレーションツール',
+  applicationName: 'Groupware',
+  appleWebApp: {
+    capable: true,
+    statusBarStyle: 'default',
+    title: 'Groupware',
+  },
+  icons: {
+    icon: '/icon.svg',
+    apple: '/icon-192.png',
+  },
 };
 
-export default function RootLayout({
+export const viewport: Viewport = {
+  width: 'device-width',
+  initialScale: 1,
+  viewportFit: 'cover',
+  themeColor: '#2563eb',
+};
+
+function resolveTheme(v: string | undefined): Theme {
+  return v === 'light' ? 'light' : 'dark'; // 既定は dark
+}
+
+function resolveLocale(v: string | undefined): Locale {
+  return v === 'ja' ? 'ja' : 'en'; // 既定は en
+}
+
+export default async function RootLayout({
   children,
 }: {
   children: React.ReactNode;
 }) {
+  const cookieStore = await cookies();
+  const theme = resolveTheme(cookieStore.get('theme')?.value);
+  const locale = resolveLocale(cookieStore.get('locale')?.value);
+
   return (
-    <html lang="ja">
+    <html
-      <body>{children}</body>
+      lang={locale}
+      className={theme === 'dark' ? 'dark' : ''}
+      style={{ colorScheme: theme }}
+    >
+      <body>
+        <I18nProvider initialLocale={locale} initialTheme={theme}>
+          {children}
+        </I18nProvider>
+        <ServiceWorkerRegister />
+      </body>
     </html>
   );
 }

app/login/page.tsx

@@ -0,0 +1,137 @@
+'use client';
+
+import { useState, type FormEvent } from 'react';
+import { useRouter } from 'next/navigation';
+import { useI18n } from '@/lib/i18n/I18nProvider';
+
+type Mode = 'login' | 'register';
+
+export default function LoginPage() {
+  const router = useRouter();
+  const { t } = useI18n();
+  const [mode, setMode] = useState<Mode>('login');
+  const [name, setName] = useState('');
+  const [email, setEmail] = useState('');
+  const [password, setPassword] = useState('');
+  const [error, setError] = useState<string | null>(null);
+  const [loading, setLoading] = useState(false);
+
+  async function onSubmit(event: FormEvent<HTMLFormElement>) {
+    event.preventDefault();
+    setLoading(true);
+    setError(null);
+
+    const endpoint =
+      mode === 'login' ? '/api/auth/login' : '/api/auth/register';
+    const payload =
+      mode === 'login' ? { email, password } : { name, email, password };
+
+    const res = await fetch(endpoint, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify(payload),
+    });
+
+    if (res.ok) {
+      router.push('/dashboard');
+      return;
+    }
+
+    const data = (await res.json().catch(() => null)) as {
+      error?: { message?: string };
+    } | null;
+    setError(data?.error?.message ?? t('auth.failed'));
+    setLoading(false);
+  }
+
+  return (
+    <main className="flex min-h-screen flex-col items-center justify-center bg-gray-50 p-8 dark:bg-gray-900">
+      <div className="w-full max-w-sm rounded-lg border bg-white p-8 shadow-sm dark:border-gray-700 dark:bg-gray-800">
+        <h1 className="text-2xl font-bold">
+          {mode === 'login' ? t('auth.login') : t('auth.register')}
+        </h1>
+
+        <form className="mt-6 space-y-4" onSubmit={onSubmit}>
+          {mode === 'register' && (
+            <div>
+              <label htmlFor="name" className="block text-sm font-medium">
+                {t('auth.displayName')}
+              </label>
+              <input
+                id="name"
+                name="name"
+                type="text"
+                value={name}
+                onChange={(e) => setName(e.target.value)}
+                className="mt-1 w-full rounded border px-3 py-2 dark:border-gray-600 dark:bg-gray-700"
+                required
+              />
+            </div>
+          )}
+          <div>
+            <label htmlFor="email" className="block text-sm font-medium">
+              {t('auth.email')}
+            </label>
+            <input
+              id="email"
+              name="email"
+              type="email"
+              autoComplete="email"
+              value={email}
+              onChange={(e) => setEmail(e.target.value)}
+              className="mt-1 w-full rounded border px-3 py-2 dark:border-gray-600 dark:bg-gray-700"
+              required
+            />
+          </div>
+          <div>
+            <label htmlFor="password" className="block text-sm font-medium">
+              {t('auth.password')}
+            </label>
+            <input
+              id="password"
+              name="password"
+              type="password"
+              autoComplete={
+                mode === 'login' ? 'current-password' : 'new-password'
+              }
+              value={password}
+              onChange={(e) => setPassword(e.target.value)}
+              className="mt-1 w-full rounded border px-3 py-2 dark:border-gray-600 dark:bg-gray-700"
+              required
+              minLength={8}
+            />
+          </div>
+
+          {error && (
+            <p className="text-sm text-red-600" role="alert">
+              {error}
+            </p>
+          )}
+
+          <button
+            type="submit"
+            disabled={loading}
+            className="w-full rounded bg-blue-600 px-4 py-2 font-medium text-white hover:bg-blue-700 disabled:opacity-50"
+          >
+            {loading
+              ? t('auth.processing')
+              : mode === 'login'
+                ? t('auth.loginButton')
+                : t('auth.registerButton')}
+          </button>
+        </form>
+
+        <button
+          type="button"
+          className="mt-4 w-full text-center text-sm text-blue-600 hover:underline dark:text-blue-400"
+          onClick={() => {
+            setMode(mode === 'login' ? 'register' : 'login');
+            setError(null);
+          }}
+        >
+          {mode === 'login' ? t('auth.registerHere') : t('auth.backToLogin')}
+        </button>
+      </div>
+    </main>
+  );
+}

app/manifest.ts

@@ -0,0 +1,51 @@
+import type { MetadataRoute } from 'next';
+
+/**
+ * PWA マニフェスト。Next.js が /manifest.webmanifest を生成し、
+ * <link rel="manifest"> を自動で <head> に出力する。
+ */
+export default function manifest(): MetadataRoute.Manifest {
+  return {
+    name: 'Groupware',
+    short_name: 'Groupware',
+    description: 'Project-based team collaboration tool',
+    start_url: '/',
+    scope: '/',
+    display: 'standalone',
+    orientation: 'any',
+    background_color: '#111827',
+    theme_color: '#2563eb',
+    lang: 'en',
+    icons: [
+      {
+        src: '/icon-192.png',
+        sizes: '192x192',
+        type: 'image/png',
+        purpose: 'any',
+      },
+      {
+        src: '/icon-192.png',
+        sizes: '192x192',
+        type: 'image/png',
+        purpose: 'maskable',
+      },
+      {
+        src: '/icon-512.png',
+        sizes: '512x512',
+        type: 'image/png',
+        purpose: 'any',
+      },
+      {
+        src: '/icon-512.png',
+        sizes: '512x512',
+        type: 'image/png',
+        purpose: 'maskable',
+      },
+      {
+        src: '/icon.svg',
+        sizes: 'any',
+        type: 'image/svg+xml',
+      },
+    ],
+  };
+}

app/notifications/page.tsx

@@ -0,0 +1,27 @@
+import { redirect } from 'next/navigation';
+import { getCurrentUser, toPublicUser } from '@/lib/auth/getCurrentUser';
+import { createNotificationService } from '@/lib/api/services';
+import { Header } from '@/components/layout/Header';
+import { NotificationList } from '@/components/notifications/NotificationList';
+
+export const dynamic = 'force-dynamic';
+
+export default async function NotificationsPage() {
+  const user = await getCurrentUser();
+  if (!user) {
+    redirect('/login');
+  }
+
+  const service = createNotificationService();
+  const { items } = service.listUnread(user.id, 1);
+
+  return (
+    <div className="min-h-screen bg-gray-50 dark:bg-gray-900">
+      <Header user={toPublicUser(user)} />
+      <main className="mx-auto max-w-2xl space-y-6 p-6">
+        <h1 className="text-2xl font-bold">通知</h1>
+        <NotificationList notifications={items} />
+      </main>
+    </div>
+  );
+}

app/page.tsx

@@ -1,10 +1,12 @@
+'use client';
+
+import { useEffect } from 'react';
+import { useRouter } from 'next/navigation';
+
 export default function Home() {
-  return (
+  const router = useRouter();
-    <main className="flex min-h-screen flex-col items-center justify-center p-8">
+  useEffect(() => {
-      <h1 className="text-3xl font-bold">シンプルグループウェア</h1>
+    router.replace('/dashboard');
-      <p className="mt-4 text-gray-600">
+  }, [router]);
-        プロジェクト単位で情報共有・タスク管理を行えるチームコラボレーションツール
+  return null;
-      </p>
-    </main>
-  );
 }

app/profile/page.tsx

@@ -0,0 +1,188 @@
+'use client';
+
+import { useEffect, useState, type FormEvent } from 'react';
+import { useRouter } from 'next/navigation';
+import type { PublicUser } from '@/lib/auth/getCurrentUser';
+import { useI18n } from '@/lib/i18n/I18nProvider';
+
+export default function ProfilePage() {
+  const router = useRouter();
+  const { t, locale, theme, setLocale, setTheme } = useI18n();
+  const [user, setUser] = useState<PublicUser | null>(null);
+  const [loading, setLoading] = useState(true);
+  const [name, setName] = useState('');
+  const [email, setEmail] = useState('');
+  const [avatarUrl, setAvatarUrl] = useState('');
+  const [error, setError] = useState<string | null>(null);
+  const [saved, setSaved] = useState(false);
+
+  useEffect(() => {
+    fetch('/api/auth/me')
+      .then((res) => (res.ok ? res.json() : Promise.reject(res)))
+      .then((data: { user: PublicUser }) => {
+        setUser(data.user);
+        setName(data.user.name);
+        setEmail(data.user.email);
+        setAvatarUrl(data.user.avatarUrl ?? '');
+      })
+      .catch(() => router.push('/login'))
+      .finally(() => setLoading(false));
+  }, [router]);
+
+  async function onSubmit(event: FormEvent<HTMLFormElement>) {
+    event.preventDefault();
+    setError(null);
+    setSaved(false);
+    const res = await fetch('/api/users/me', {
+      method: 'PATCH',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ name, email, avatarUrl }),
+    });
+    if (res.ok) {
+      const data = (await res.json()) as { user: PublicUser };
+      setUser(data.user);
+      setSaved(true);
+    } else {
+      const data = (await res.json().catch(() => null)) as {
+        error?: { message?: string };
+      } | null;
+      setError(data?.error?.message ?? t('auth.failed'));
+    }
+  }
+
+  async function onLogout() {
+    await fetch('/api/auth/logout', { method: 'POST' });
+    router.push('/login');
+  }
+
+  if (loading) {
+    return (
+      <main className="flex min-h-screen items-center justify-center bg-gray-50 dark:bg-gray-900">
+        <p className="text-gray-500 dark:text-gray-400">
+          {t('common.loading')}
+        </p>
+      </main>
+    );
+  }
+
+  return (
+    <main className="min-h-screen bg-gray-50 p-8 dark:bg-gray-900">
+      <div className="mx-auto max-w-md rounded-lg border bg-white p-8 shadow-sm dark:border-gray-700 dark:bg-gray-800">
+        <div className="flex items-center justify-between">
+          <h1 className="text-2xl font-bold">{t('profile.title')}</h1>
+          <button
+            type="button"
+            onClick={onLogout}
+            className="text-sm text-blue-600 hover:underline dark:text-blue-400"
+          >
+            {t('header.logout')}
+          </button>
+        </div>
+
+        <form className="mt-6 space-y-4" onSubmit={onSubmit}>
+          <div>
+            <label htmlFor="name" className="block text-sm font-medium">
+              {t('profile.displayName')}
+            </label>
+            <input
+              id="name"
+              type="text"
+              value={name}
+              onChange={(e) => setName(e.target.value)}
+              className="mt-1 w-full rounded border px-3 py-2 dark:border-gray-600 dark:bg-gray-700"
+            />
+          </div>
+          <div>
+            <label htmlFor="email" className="block text-sm font-medium">
+              {t('profile.email')}
+            </label>
+            <input
+              id="email"
+              type="email"
+              value={email}
+              onChange={(e) => setEmail(e.target.value)}
+              className="mt-1 w-full rounded border px-3 py-2 dark:border-gray-600 dark:bg-gray-700"
+            />
+          </div>
+          <div>
+            <label htmlFor="avatarUrl" className="block text-sm font-medium">
+              {t('profile.avatarUrl')}
+            </label>
+            <input
+              id="avatarUrl"
+              type="url"
+              value={avatarUrl}
+              onChange={(e) => setAvatarUrl(e.target.value)}
+              className="mt-1 w-full rounded border px-3 py-2 dark:border-gray-600 dark:bg-gray-700"
+            />
+          </div>
+
+          {error && (
+            <p className="text-sm text-red-600" role="alert">
+              {error}
+            </p>
+          )}
+          {saved && (
+            <p className="text-sm text-green-600">{t('profile.saved')}</p>
+          )}
+
+          <button
+            type="submit"
+            className="w-full rounded bg-blue-600 px-4 py-2 font-medium text-white hover:bg-blue-700"
+          >
+            {t('common.save')}
+          </button>
+        </form>
+
+        <div className="mt-6 space-y-3 border-t pt-4 dark:border-gray-700">
+          <div>
+            <label htmlFor="theme-select" className="block text-sm font-medium">
+              {t('profile.theme')}
+            </label>
+            <select
+              id="theme-select"
+              value={theme}
+              onChange={(e) =>
+                void setTheme(e.target.value as 'dark' | 'light')
+              }
+              className="mt-1 w-full rounded border px-3 py-2 dark:border-gray-600 dark:bg-gray-700"
+              data-testid="profile-theme-select"
+            >
+              <option value="dark">{t('theme.dark')}</option>
+              <option value="light">{t('theme.light')}</option>
+            </select>
+          </div>
+          <div>
+            <label
+              htmlFor="locale-select"
+              className="block text-sm font-medium"
+            >
+              {t('profile.language')}
+            </label>
+            <select
+              id="locale-select"
+              value={locale}
+              onChange={(e) => setLocale(e.target.value as 'en' | 'ja')}
+              className="mt-1 w-full rounded border px-3 py-2 dark:border-gray-600 dark:bg-gray-700"
+              data-testid="profile-locale-select"
+            >
+              <option value="en">{t('language.english')}</option>
+              <option value="ja">{t('language.japanese')}</option>
+            </select>
+          </div>
+        </div>
+
+        <button
+          type="button"
+          onClick={() => router.push('/dashboard')}
+          className="mt-4 w-full text-center text-sm text-blue-600 hover:underline dark:text-blue-400"
+        >
+          {t('profile.backToDashboard')}
+        </button>
+        <p className="mt-2 text-center text-xs text-gray-500 dark:text-gray-400">
+          {t('profile.role')}: {user?.role}
+        </p>
+      </div>
+    </main>
+  );
+}

app/projects/[projectId]/activity/page.tsx

@@ -0,0 +1,85 @@
+import { redirect } from 'next/navigation';
+import { getCurrentUser, toPublicUser } from '@/lib/auth/getCurrentUser';
+import {
+  createProjectService,
+  createActivityLogService,
+} from '@/lib/api/services';
+import { Header } from '@/components/layout/Header';
+import { ProjectNav } from '@/components/layout/ProjectNav';
+import { ForbiddenError, NotFoundError } from '@/lib/errors';
+
+export const dynamic = 'force-dynamic';
+
+const ACTION_LABELS: Record<string, string> = {
+  todo_created: 'ToDo作成',
+  todo_updated: 'ToDo更新',
+  todo_completed: 'ToDo完了',
+  file_uploaded: 'ファイルアップロード',
+  board_posted: '掲示板投稿',
+  comment_added: 'コメント追加',
+  note_created: 'メモ作成',
+  note_updated: 'メモ更新',
+  meeting_created: 'ミーティング作成',
+  member_added: 'メンバー追加',
+  milestone_updated: 'マイルストーン更新',
+};
+
+export default async function ProjectActivityPage({
+  params,
+}: {
+  params: Promise<{ projectId: string }>;
+}) {
+  const user = await getCurrentUser();
+  if (!user) {
+    redirect('/login');
+  }
+  const { projectId } = await params;
+
+  const projectService = createProjectService();
+  let project;
+  try {
+    project = projectService.getProject(user.id, Number(projectId));
+  } catch (error) {
+    if (error instanceof ForbiddenError || error instanceof NotFoundError) {
+      redirect('/dashboard');
+    }
+    throw error;
+  }
+
+  const activityService = createActivityLogService();
+  const { items } = activityService.listByProject(project.id, 1);
+
+  return (
+    <div className="min-h-screen bg-gray-50 dark:bg-gray-900">
+      <Header user={toPublicUser(user)} />
+      <ProjectNav projectId={project.id} active="activity" />
+      <main className="mx-auto max-w-3xl space-y-6 p-6">
+        <h1 className="text-2xl font-bold">アクティビティログ</h1>
+        {items.length === 0 ? (
+          <p className="text-sm text-gray-400 dark:text-gray-500">
+            アクティビティはありません。
+          </p>
+        ) : (
+          <ul className="divide-y rounded-lg border bg-white dark:bg-gray-800 shadow-sm">
+            {items.map((log) => (
+              <li key={log.id} className="p-4">
+                <div className="flex items-center justify-between">
+                  <span className="rounded bg-gray-100 dark:bg-gray-700 px-2 py-0.5 text-xs">
+                    {ACTION_LABELS[log.action] ?? log.action}
+                  </span>
+                  <span className="text-xs text-gray-400 dark:text-gray-500">
+                    {log.createdAt}
+                  </span>
+                </div>
+                <p className="mt-2 text-sm text-gray-700 dark:text-gray-200">
+                  {log.targetType}
+                  {log.targetId !== null ? ` #${log.targetId}` : ''}
+                </p>
+              </li>
+            ))}
+          </ul>
+        )}
+      </main>
+    </div>
+  );
+}

app/projects/[projectId]/board/[threadId]/page.tsx

@@ -0,0 +1,116 @@
+import { redirect } from 'next/navigation';
+import { getCurrentUser, toPublicUser } from '@/lib/auth/getCurrentUser';
+import { createBoardService } from '@/lib/api/services';
+import { Header } from '@/components/layout/Header';
+import { ProjectNav } from '@/components/layout/ProjectNav';
+import { MarkdownBody } from '@/components/board/MarkdownBody';
+import { CommentForm } from '@/components/board/CommentForm';
+import { AttachmentList } from '@/components/files/AttachmentList';
+import type { AttachmentView } from '@/lib/types';
+import { ForbiddenError, NotFoundError } from '@/lib/errors';
+
+export const dynamic = 'force-dynamic';
+
+export default async function ThreadDetailPage({
+  params,
+}: {
+  params: Promise<{ projectId: string; threadId: string }>;
+}) {
+  const user = await getCurrentUser();
+  if (!user) redirect('/login');
+  const { projectId, threadId } = await params;
+
+  const boardService = createBoardService();
+  let thread;
+  let comments;
+  let attachments: { thread: AttachmentView[]; comments: AttachmentView[] };
+  try {
+    thread = boardService.getThread(user.id, Number(threadId));
+    comments = boardService.listComments(user.id, Number(threadId));
+    attachments = boardService.getAttachments(
+      user.id,
+      thread.id,
+      comments.items.map((c) => c.id)
+    );
+  } catch (error) {
+    if (error instanceof ForbiddenError || error instanceof NotFoundError) {
+      redirect(`/projects/${projectId}/board`);
+    }
+    throw error;
+  }
+
+  // コメントIDごとに添付をグループ化
+  const commentAttachments = new Map(
+    attachments.comments.map((a) => [
+      a.targetId,
+      [] as typeof attachments.comments,
+    ])
+  );
+  for (const a of attachments.comments) {
+    const list = commentAttachments.get(a.targetId);
+    if (list) list.push(a);
+  }
+
+  return (
+    <div className="min-h-screen bg-gray-50 dark:bg-gray-900">
+      <Header user={toPublicUser(user)} />
+      <ProjectNav projectId={Number(projectId)} active="board" />
+      <main className="mx-auto max-w-3xl space-y-6 p-6">
+        <a
+          href={`/projects/${projectId}/board`}
+          className="text-sm text-blue-600 hover:underline"
+        >
+          ← 掲示板一覧へ
+        </a>
+        <div className="rounded-lg border bg-white dark:bg-gray-800 p-6 shadow-sm">
+          <div className="flex items-center justify-between">
+            <h1 className="text-2xl font-bold">{thread.title}</h1>
+            {thread.category && (
+              <span className="rounded bg-gray-100 dark:bg-gray-700 px-2 py-0.5 text-xs">
+                {thread.category}
+              </span>
+            )}
+          </div>
+          <div className="mt-4">
+            <MarkdownBody bodyMd={thread.bodyMd} />
+          </div>
+          {attachments.thread.length > 0 && (
+            <div className="mt-4">
+              <p className="mb-1 text-xs font-medium text-gray-500 dark:text-gray-400">
+                添付ファイル
+              </p>
+              <AttachmentList attachments={attachments.thread} />
+            </div>
+          )}
+          <p className="mt-4 text-xs text-gray-400 dark:text-gray-500">
+            投稿: {thread.createdAt} / 更新: {thread.updatedAt}
+          </p>
+        </div>
+
+        <section className="space-y-4">
+          <h2 className="text-lg font-bold">コメント ({comments.total})</h2>
+          {comments.items.map((comment) => (
+            <div
+              key={comment.id}
+              className="rounded-lg border bg-white dark:bg-gray-800 p-4 shadow-sm"
+            >
+              <MarkdownBody bodyMd={comment.bodyMd} />
+              {commentAttachments.has(comment.id) &&
+                commentAttachments.get(comment.id)!.length > 0 && (
+                  <div className="mt-2">
+                    <AttachmentList
+                      attachments={commentAttachments.get(comment.id)!}
+                    />
+                  </div>
+                )}
+              <p className="mt-2 text-xs text-gray-400 dark:text-gray-500">
+                {comment.createdAt}
+              </p>
+            </div>
+          ))}
+          <CommentForm projectId={Number(projectId)} threadId={thread.id} />
+        </section>
+      </main>
+    </div>
+  );
+}

app/projects/[projectId]/board/page.tsx

@@ -0,0 +1,81 @@
+import { redirect } from 'next/navigation';
+import { getCurrentUser, toPublicUser } from '@/lib/auth/getCurrentUser';
+import { createBoardService, createProjectService } from '@/lib/api/services';
+import { Header } from '@/components/layout/Header';
+import { ProjectNav } from '@/components/layout/ProjectNav';
+import { ThreadForm } from '@/components/board/ThreadForm';
+import { ForbiddenError, NotFoundError } from '@/lib/errors';
+
+export const dynamic = 'force-dynamic';
+
+export default async function BoardPage({
+  params,
+  searchParams,
+}: {
+  params: Promise<{ projectId: string }>;
+  searchParams: Promise<{ q?: string; page?: string }>;
+}) {
+  const user = await getCurrentUser();
+  if (!user) redirect('/login');
+  const { projectId } = await params;
+  const { q, page } = await searchParams;
+
+  const projectService = createProjectService();
+  let project: Awaited<ReturnType<typeof projectService.getProject>>;
+  try {
+    project = projectService.getProject(user.id, Number(projectId));
+  } catch (error) {
+    if (error instanceof ForbiddenError || error instanceof NotFoundError) {
+      redirect('/dashboard');
+    }
+    throw error;
+  }
+
+  const boardService = createBoardService();
+  const { items } = boardService.listThreads(user.id, project.id, {
+    page: Number(page ?? '1') || 1,
+    search: q,
+  });
+
+  return (
+    <div className="min-h-screen bg-gray-50 dark:bg-gray-900">
+      <Header user={toPublicUser(user)} />
+      <ProjectNav projectId={project.id} active="board" />
+      <main className="mx-auto max-w-3xl space-y-6 p-6">
+        <h1 className="text-2xl font-bold">掲示板</h1>
+        <ThreadForm projectId={project.id} />
+        <section className="space-y-3">
+          {items.length === 0 ? (
+            <p className="text-sm text-gray-400 dark:text-gray-500">
+              スレッドはありません。
+            </p>
+          ) : (
+            items.map((thread) => (
+              <a
+                key={thread.id}
+                href={`/projects/${project.id}/board/${thread.id}`}
+                className="block rounded-lg border bg-white dark:bg-gray-800 p-4 shadow-sm hover:shadow-md"
+              >
+                <div className="flex items-center justify-between">
+                  <h3 className="font-semibold text-gray-800 dark:text-gray-100">
+                    {thread.isPinned === 1 && '📌 '}
+                    {thread.isImportant === 1 && '❗ '}
+                    {thread.title}
+                  </h3>
+                  {thread.category && (
+                    <span className="rounded bg-gray-100 dark:bg-gray-700 px-2 py-0.5 text-xs">
+                      {thread.category}
+                    </span>
+                  )}
+                </div>
+                <p className="mt-1 text-xs text-gray-400 dark:text-gray-500">
+                  {thread.createdAt}
+                </p>
+              </a>
+            ))
+          )}
+        </section>
+      </main>
+    </div>
+  );
+}

app/projects/[projectId]/calendar/page.tsx

@@ -0,0 +1,82 @@
+import { redirect } from 'next/navigation';
+import { getCurrentUser, toPublicUser } from '@/lib/auth/getCurrentUser';
+import {
+  createScheduleService,
+  createProjectService,
+} from '@/lib/api/services';
+import { Header } from '@/components/layout/Header';
+import { ProjectNav } from '@/components/layout/ProjectNav';
+import { CalendarEventForm } from '@/components/calendar/CalendarEventForm';
+import { CalendarView } from '@/components/calendar/CalendarView';
+import {
+  rangeForView,
+  toISODate,
+  parseISODate,
+  type CalendarViewMode,
+} from '@/lib/calendar/grid';
+import { ForbiddenError, NotFoundError } from '@/lib/errors';
+
+export const dynamic = 'force-dynamic';
+
+const VALID_VIEWS: CalendarViewMode[] = ['month', 'week', 'day'];
+
+function isCalendarView(v: unknown): v is CalendarViewMode {
+  return typeof v === 'string' && (VALID_VIEWS as string[]).includes(v);
+}
+
+export default async function CalendarPage({
+  params,
+  searchParams,
+}: {
+  params: Promise<{ projectId: string }>;
+  searchParams: Promise<{ view?: string; date?: string }>;
+}) {
+  const user = await getCurrentUser();
+  if (!user) redirect('/login');
+  const { projectId } = await params;
+  const { view, date } = await searchParams;
+
+  const projectService = createProjectService();
+  let project: Awaited<ReturnType<typeof projectService.getProject>>;
+  try {
+    project = projectService.getProject(user.id, Number(projectId));
+  } catch (error) {
+    if (error instanceof ForbiddenError || error instanceof NotFoundError) {
+      redirect('/dashboard');
+    }
+    throw error;
+  }
+
+  // 表示モードと基準日を解決(不正値はデフォルトへフォールバック)
+  const resolvedView: CalendarViewMode = isCalendarView(view) ? view : 'month';
+  const today = new Date();
+  const anchor =
+    date && /^\d{4}-\d{2}-\d{2}$/.test(date) ? parseISODate(date) : today;
+
+  // ビューに応じた取得範囲を計算しイベントを取得。
+  // アクセス権は getProject で参加確認済みなのでここでは再チェックしない。
+  const range = rangeForView(resolvedView, anchor);
+  const scheduleService = createScheduleService();
+  const events = scheduleService.getCalendarEvents(user.id, project.id, range);
+
+  return (
+    <div className="min-h-screen bg-gray-50 dark:bg-gray-900">
+      <Header user={toPublicUser(user)} />
+      <ProjectNav projectId={project.id} active="calendar" />
+      <main className="mx-auto max-w-6xl space-y-6 p-6">
+        <h1 className="text-2xl font-bold">カレンダー</h1>
+        <CalendarEventForm
+          projectId={project.id}
+          defaultDate={toISODate(anchor)}
+        />
+        <CalendarView
+          projectId={project.id}
+          events={events}
+          view={resolvedView}
+          anchorDate={toISODate(anchor)}
+          todayKey={toISODate(today)}
+        />
+      </main>
+    </div>
+  );
+}

app/projects/[projectId]/chat/page.tsx

@@ -0,0 +1,41 @@
+import { redirect } from 'next/navigation';
+import { getCurrentUser, toPublicUser } from '@/lib/auth/getCurrentUser';
+import { createProjectService } from '@/lib/api/services';
+import { Header } from '@/components/layout/Header';
+import { ProjectNav } from '@/components/layout/ProjectNav';
+import { ChatWindow } from '@/components/chat/ChatWindow';
+import { ForbiddenError, NotFoundError } from '@/lib/errors';
+
+export const dynamic = 'force-dynamic';
+
+export default async function ChatPage({
+  params,
+}: {
+  params: Promise<{ projectId: string }>;
+}) {
+  const user = await getCurrentUser();
+  if (!user) redirect('/login');
+  const { projectId } = await params;
+
+  const projectService = createProjectService();
+  let project: Awaited<ReturnType<typeof projectService.getProject>>;
+  try {
+    project = projectService.getProject(user.id, Number(projectId));
+  } catch (error) {
+    if (error instanceof ForbiddenError || error instanceof NotFoundError) {
+      redirect('/dashboard');
+    }
+    throw error;
+  }
+
+  return (
+    <div className="min-h-screen bg-gray-50 dark:bg-gray-900">
+      <Header user={toPublicUser(user)} />
+      <ProjectNav projectId={project.id} active="chat" />
+      <main className="mx-auto max-w-3xl space-y-4 p-6">
+        <h1 className="text-2xl font-bold">チャット</h1>
+        <ChatWindow projectId={project.id} userName={user.name} />
+      </main>
+    </div>
+  );
+}

app/projects/[projectId]/files/page.tsx

@@ -0,0 +1,52 @@
+import { redirect } from 'next/navigation';
+import { getCurrentUser, toPublicUser } from '@/lib/auth/getCurrentUser';
+import {
+  createFileStorageService,
+  createProjectService,
+} from '@/lib/api/services';
+import { Header } from '@/components/layout/Header';
+import { ProjectNav } from '@/components/layout/ProjectNav';
+import { Uploader } from '@/components/files/Uploader';
+import { FileList } from '@/components/files/FileList';
+import { ForbiddenError, NotFoundError } from '@/lib/errors';
+
+export const dynamic = 'force-dynamic';
+
+export default async function FilesPage({
+  params,
+}: {
+  params: Promise<{ projectId: string }>;
+}) {
+  const user = await getCurrentUser();
+  if (!user) redirect('/login');
+  const { projectId } = await params;
+
+  const projectService = createProjectService();
+  let project: Awaited<ReturnType<typeof projectService.getProject>>;
+  try {
+    project = projectService.getProject(user.id, Number(projectId));
+  } catch (error) {
+    if (error instanceof ForbiddenError || error instanceof NotFoundError) {
+      redirect('/dashboard');
+    }
+    throw error;
+  }
+
+  const fileService = createFileStorageService();
+  const { items } = fileService.listFiles(user.id, project.id);
+  const canDelete =
+    projectService.getMemberRole(user.id, project.id) === 'admin' ||
+    items.some((f) => f.uploaderId === user.id);
+
+  return (
+    <div className="min-h-screen bg-gray-50 dark:bg-gray-900">
+      <Header user={toPublicUser(user)} />
+      <ProjectNav projectId={project.id} active="files" />
+      <main className="mx-auto max-w-4xl space-y-6 p-6">
+        <h1 className="text-2xl font-bold">ファイル</h1>
+        <Uploader projectId={project.id} />
+        <FileList files={items} canDelete={canDelete} />
+      </main>
+    </div>
+  );
+}

app/projects/[projectId]/meetings/page.tsx

@@ -0,0 +1,80 @@
+import { redirect } from 'next/navigation';
+import { getCurrentUser, toPublicUser } from '@/lib/auth/getCurrentUser';
+import { createMeetingService, createProjectService } from '@/lib/api/services';
+import { Header } from '@/components/layout/Header';
+import { ProjectNav } from '@/components/layout/ProjectNav';
+import { MeetingForm } from '@/components/meetings/MeetingForm';
+import { ForbiddenError, NotFoundError } from '@/lib/errors';
+
+export const dynamic = 'force-dynamic';
+
+export default async function MeetingsPage({
+  params,
+}: {
+  params: Promise<{ projectId: string }>;
+}) {
+  const user = await getCurrentUser();
+  if (!user) redirect('/login');
+  const { projectId } = await params;
+
+  const projectService = createProjectService();
+  let project: Awaited<ReturnType<typeof projectService.getProject>>;
+  try {
+    project = projectService.getProject(user.id, Number(projectId));
+  } catch (error) {
+    if (error instanceof ForbiddenError || error instanceof NotFoundError) {
+      redirect('/dashboard');
+    }
+    throw error;
+  }
+
+  const meetingService = createMeetingService();
+  const meetings = meetingService.getMeetings(user.id, project.id);
+  const members = projectService.getMembers(user.id, project.id).map((m) => ({
+    userId: m.userId,
+    name: m.user.name,
+  }));
+
+  return (
+    <div className="min-h-screen bg-gray-50 dark:bg-gray-900">
+      <Header user={toPublicUser(user)} />
+      <ProjectNav projectId={project.id} active="meetings" />
+      <main className="mx-auto max-w-3xl space-y-6 p-6">
+        <h1 className="text-2xl font-bold">ミーティング</h1>
+        <MeetingForm projectId={project.id} members={members} />
+        <section className="space-y-3">
+          {meetings.length === 0 ? (
+            <p className="text-sm text-gray-400 dark:text-gray-500">
+              ミーティングはありません。
+            </p>
+          ) : (
+            meetings.map((m) => (
+              <div
+                key={m.id}
+                className="rounded-lg border bg-white dark:bg-gray-800 p-4 shadow-sm"
+                data-testid={`meeting-${m.id}`}
+              >
+                <h3 className="font-semibold text-gray-800 dark:text-gray-100">
+                  {m.title}
+                </h3>
+                <p className="text-xs text-gray-500 dark:text-gray-400">
+                  {m.startAt} 〜 {m.endAt}
+                </p>
+                {m.location && (
+                  <p className="text-xs text-gray-500 dark:text-gray-400">
+                    場所: {m.location}
+                  </p>
+                )}
+                {m.minutesMd && (
+                  <p className="mt-2 text-sm text-gray-600 dark:text-gray-300">
+                    議事録あり
+                  </p>
+                )}
+              </div>
+            ))
+          )}
+        </section>
+      </main>
+    </div>
+  );
+}

app/projects/[projectId]/members/page.tsx

@@ -0,0 +1,88 @@
+import { redirect } from 'next/navigation';
+import { getCurrentUser, toPublicUser } from '@/lib/auth/getCurrentUser';
+import { createProjectService } from '@/lib/api/services';
+import { Header } from '@/components/layout/Header';
+import { ProjectNav } from '@/components/layout/ProjectNav';
+import { AddMemberForm } from '@/components/project/AddMemberForm';
+import { RemoveMemberButton } from '@/components/project/RemoveMemberButton';
+import { ForbiddenError, NotFoundError } from '@/lib/errors';
+
+export const dynamic = 'force-dynamic';
+
+const ROLE_LABEL = { admin: '管理者', member: 'メンバー', guest: 'ゲスト' };
+
+export default async function ProjectMembersPage({
+  params,
+}: {
+  params: Promise<{ projectId: string }>;
+}) {
+  const user = await getCurrentUser();
+  if (!user) {
+    redirect('/login');
+  }
+  const { projectId } = await params;
+
+  const service = createProjectService();
+  let project: Awaited<ReturnType<typeof service.getProject>>;
+  let members: Awaited<ReturnType<typeof service.getMembers>>;
+  let canManage: boolean;
+  try {
+    project = service.getProject(user.id, Number(projectId));
+    members = service.getMembers(user.id, Number(projectId));
+    canManage = service.getMemberRole(user.id, Number(projectId)) === 'admin';
+  } catch (error) {
+    if (error instanceof ForbiddenError || error instanceof NotFoundError) {
+      redirect('/dashboard');
+    }
+    throw error;
+  }
+
+  return (
+    <div className="min-h-screen bg-gray-50 dark:bg-gray-900">
+      <Header user={toPublicUser(user)} />
+      <ProjectNav projectId={project.id} active="members" />
+      <main className="mx-auto max-w-3xl space-y-6 p-6">
+        <h1 className="text-2xl font-bold">メンバー管理</h1>
+
+        {canManage && <AddMemberForm projectId={project.id} />}
+
+        <section className="rounded-lg border bg-white dark:bg-gray-800 shadow-sm">
+          <ul className="divide-y">
+            {members.map((member) => (
+              <li
+                key={member.id}
+                className="flex items-center justify-between p-4"
+              >
+                <div>
+                  <p className="font-medium text-gray-800 dark:text-gray-100">
+                    {member.user.name}
+                    {member.userId === user.id && (
+                      <span className="ml-2 text-xs text-gray-400 dark:text-gray-500">
+                        (あなた)
+                      </span>
+                    )}
+                  </p>
+                  <p className="text-sm text-gray-500 dark:text-gray-400">
+                    {member.user.email}
+                  </p>
+                </div>
+                <div className="flex items-center gap-3">
+                  <span className="text-sm text-gray-600 dark:text-gray-300">
+                    {ROLE_LABEL[member.role] ?? member.role}
+                  </span>
+                  {canManage && member.userId !== user.id && (
+                    <RemoveMemberButton
+                      projectId={project.id}
+                      userId={member.userId}
+                      label="削除"
+                    />
+                  )}
+                </div>
+              </li>
+            ))}
+          </ul>
+        </section>
+      </main>
+    </div>
+  );
+}

app/projects/[projectId]/milestones/page.tsx

@@ -0,0 +1,97 @@
+import { redirect } from 'next/navigation';
+import { getCurrentUser, toPublicUser } from '@/lib/auth/getCurrentUser';
+import {
+  createScheduleService,
+  createProjectService,
+} from '@/lib/api/services';
+import { Header } from '@/components/layout/Header';
+import { ProjectNav } from '@/components/layout/ProjectNav';
+import { MilestoneForm } from '@/components/calendar/MilestoneForm';
+import { ForbiddenError, NotFoundError } from '@/lib/errors';
+
+export const dynamic = 'force-dynamic';
+
+function progressColor(progress: number): string {
+  if (progress >= 67) return 'bg-green-500';
+  if (progress >= 34) return 'bg-yellow-500';
+  return 'bg-red-500';
+}
+
+export default async function MilestonesPage({
+  params,
+}: {
+  params: Promise<{ projectId: string }>;
+}) {
+  const user = await getCurrentUser();
+  if (!user) redirect('/login');
+  const { projectId } = await params;
+
+  const projectService = createProjectService();
+  let project: Awaited<ReturnType<typeof projectService.getProject>>;
+  try {
+    project = projectService.getProject(user.id, Number(projectId));
+  } catch (error) {
+    if (error instanceof ForbiddenError || error instanceof NotFoundError) {
+      redirect('/dashboard');
+    }
+    throw error;
+  }
+
+  const scheduleService = createScheduleService();
+  const milestones = scheduleService.getMilestones(user.id, project.id);
+
+  return (
+    <div className="min-h-screen bg-gray-50 dark:bg-gray-900">
+      <Header user={toPublicUser(user)} />
+      <ProjectNav projectId={project.id} active="milestones" />
+      <main className="mx-auto max-w-3xl space-y-6 p-6">
+        <h1 className="text-2xl font-bold">マイルストーン</h1>
+        <MilestoneForm projectId={project.id} />
+        <section className="space-y-3">
+          {milestones.length === 0 ? (
+            <p className="text-sm text-gray-400 dark:text-gray-500">
+              マイルストーンはありません。
+            </p>
+          ) : (
+            milestones.map((m) => (
+              <div
+                key={m.id}
+                className="rounded-lg border bg-white dark:bg-gray-800 p-4 shadow-sm"
+                data-testid={`milestone-${m.id}`}
+              >
+                <div className="flex items-center justify-between">
+                  <h3 className="font-semibold text-gray-800 dark:text-gray-100">
+                    {m.title}
+                  </h3>
+                  <span className="text-xs text-gray-500 dark:text-gray-400">
+                    {m.status}
+                    {m.dueDate ? ` / 期限: ${m.dueDate}` : ''}
+                  </span>
+                </div>
+                {m.description && (
+                  <p className="mt-1 text-sm text-gray-600 dark:text-gray-300">
+                    {m.description}
+                  </p>
+                )}
+                <div className="mt-3">
+                  <div className="flex items-center justify-between text-xs text-gray-500 dark:text-gray-400">
+                    <span>進捗</span>
+                    <span data-testid={`milestone-progress-${m.id}`}>
+                      {m.progress}%
+                    </span>
+                  </div>
+                  <div className="mt-1 h-2 w-full rounded bg-gray-200 dark:bg-gray-700">
+                    <div
+                      className={`h-2 rounded ${progressColor(m.progress)}`}
+                      style={{ width: `${m.progress}%` }}
+                    />
+                  </div>
+                </div>
+              </div>
+            ))
+          )}
+        </section>
+      </main>
+    </div>
+  );
+}

app/projects/[projectId]/notes/[noteId]/page.tsx

@@ -0,0 +1,65 @@
+import { redirect } from 'next/navigation';
+import { getCurrentUser, toPublicUser } from '@/lib/auth/getCurrentUser';
+import { createNoteService } from '@/lib/api/services';
+import { Header } from '@/components/layout/Header';
+import { ProjectNav } from '@/components/layout/ProjectNav';
+import { MarkdownBody } from '@/components/board/MarkdownBody';
+import { NoteEditor } from '@/components/notes/NoteEditor';
+import { ForbiddenError, NotFoundError } from '@/lib/errors';
+import type { ProjectNote } from '@/lib/types';
+
+export const dynamic = 'force-dynamic';
+
+export default async function NoteDetailPage({
+  params,
+}: {
+  params: Promise<{ projectId: string; noteId: string }>;
+}) {
+  const user = await getCurrentUser();
+  if (!user) redirect('/login');
+  const { projectId, noteId } = await params;
+
+  const noteService = createNoteService();
+  let note: ProjectNote;
+  try {
+    note = noteService.getNote(user.id, Number(noteId));
+  } catch (error) {
+    if (error instanceof ForbiddenError || error instanceof NotFoundError) {
+      redirect(`/projects/${projectId}/notes`);
+    }
+    throw error;
+  }
+
+  return (
+    <div className="min-h-screen bg-gray-50 dark:bg-gray-900">
+      <Header user={toPublicUser(user)} />
+      <ProjectNav projectId={Number(projectId)} active="notes" />
+      <main className="mx-auto max-w-3xl space-y-6 p-6">
+        <a
+          href={`/projects/${projectId}/notes`}
+          className="text-sm text-blue-600 hover:underline"
+        >
+          ← メモ一覧へ
+        </a>
+        <div className="rounded-lg border bg-white dark:bg-gray-800 p-6 shadow-sm">
+          <h1 className="text-2xl font-bold">
+            {note.isPinned === 1 && '📌 '}
+            {note.title}
+          </h1>
+          {note.tags && (
+            <p className="mt-1 text-xs text-gray-500 dark:text-gray-400">
+              {note.tags}
+            </p>
+          )}
+          <div className="mt-4">
+            <MarkdownBody bodyMd={note.bodyMd} />
+          </div>
+          <p className="mt-4 text-xs text-gray-400 dark:text-gray-500">
+            作成: {note.createdAt} / 更新: {note.updatedAt}
+          </p>
+        </div>
+        <NoteEditor projectId={Number(projectId)} note={note} />
+      </main>
+    </div>
+  );
+}

app/projects/[projectId]/notes/page.tsx

@@ -0,0 +1,80 @@
+import { redirect } from 'next/navigation';
+import { getCurrentUser, toPublicUser } from '@/lib/auth/getCurrentUser';
+import { createNoteService, createProjectService } from '@/lib/api/services';
+import { Header } from '@/components/layout/Header';
+import { ProjectNav } from '@/components/layout/ProjectNav';
+import { NoteForm } from '@/components/notes/NoteForm';
+import { ForbiddenError, NotFoundError } from '@/lib/errors';
+
+export const dynamic = 'force-dynamic';
+
+export default async function NotesPage({
+  params,
+  searchParams,
+}: {
+  params: Promise<{ projectId: string }>;
+  searchParams: Promise<{ q?: string; page?: string }>;
+}) {
+  const user = await getCurrentUser();
+  if (!user) redirect('/login');
+  const { projectId } = await params;
+  const { q, page } = await searchParams;
+
+  const projectService = createProjectService();
+  let project: Awaited<ReturnType<typeof projectService.getProject>>;
+  try {
+    project = projectService.getProject(user.id, Number(projectId));
+  } catch (error) {
+    if (error instanceof ForbiddenError || error instanceof NotFoundError) {
+      redirect('/dashboard');
+    }
+    throw error;
+  }
+
+  const noteService = createNoteService();
+  const { items } = noteService.listNotes(user.id, project.id, {
+    page: Number(page ?? '1') || 1,
+    search: q,
+  });
+
+  return (
+    <div className="min-h-screen bg-gray-50 dark:bg-gray-900">
+      <Header user={toPublicUser(user)} />
+      <ProjectNav projectId={project.id} active="notes" />
+      <main className="mx-auto max-w-3xl space-y-6 p-6">
+        <h1 className="text-2xl font-bold">Markdownメモ</h1>
+        <NoteForm projectId={project.id} />
+        <section className="space-y-3">
+          {items.length === 0 ? (
+            <p className="text-sm text-gray-400 dark:text-gray-500">
+              メモはありません。
+            </p>
+          ) : (
+            items.map((note) => (
+              <a
+                key={note.id}
+                href={`/projects/${project.id}/notes/${note.id}`}
+                className="block rounded-lg border bg-white dark:bg-gray-800 p-4 shadow-sm hover:shadow-md"
+              >
+                <div className="flex items-center justify-between">
+                  <h3 className="font-semibold text-gray-800 dark:text-gray-100">
+                    {note.isPinned === 1 && '📌 '}
+                    {note.title}
+                  </h3>
+                  {note.tags && (
+                    <span className="text-xs text-gray-500 dark:text-gray-400">
+                      {note.tags}
+                    </span>
+                  )}
+                </div>
+                <p className="mt-1 text-xs text-gray-400 dark:text-gray-500">
+                  {note.updatedAt}
+                </p>
+              </a>
+            ))
+          )}
+        </section>
+      </main>
+    </div>
+  );
+}

app/projects/[projectId]/page.tsx

@@ -0,0 +1,148 @@
+import { redirect } from 'next/navigation';
+import { getCurrentUser, toPublicUser } from '@/lib/auth/getCurrentUser';
+import { createDashboardService } from '@/lib/api/services';
+import { Header } from '@/components/layout/Header';
+import { ProjectNav } from '@/components/layout/ProjectNav';
+import { DashboardWidget } from '@/components/project/DashboardWidget';
+import { ForbiddenError } from '@/lib/errors';
+
+export const dynamic = 'force-dynamic';
+
+export default async function ProjectOverviewPage({
+  params,
+}: {
+  params: Promise<{ projectId: string }>;
+}) {
+  const user = await getCurrentUser();
+  if (!user) redirect('/login');
+  const { projectId } = await params;
+
+  const service = createDashboardService();
+  let dashboard;
+  try {
+    dashboard = service.getProjectDashboard(user.id, Number(projectId));
+  } catch (error) {
+    if (error instanceof ForbiddenError) {
+      redirect('/dashboard');
+    }
+    throw error;
+  }
+
+  const { project } = dashboard;
+
+  return (
+    <div className="min-h-screen bg-gray-50 dark:bg-gray-900">
+      <Header user={toPublicUser(user)} />
+      <ProjectNav projectId={project.id} active="overview" />
+      <main className="mx-auto max-w-4xl space-y-6 p-6">
+        <div className="flex items-center justify-between">
+          <h1 className="text-2xl font-bold">{project.name}</h1>
+          <span className="rounded bg-gray-100 dark:bg-gray-700 px-2 py-0.5 text-xs">
+            {project.status}
+          </span>
+        </div>
+        {project.description && (
+          <p className="text-gray-600 dark:text-gray-300">
+            {project.description}
+          </p>
+        )}
+
+        <div className="grid gap-4 sm:grid-cols-2">
+          <DashboardWidget title="進行中ToDo" empty="ありません">
+            {dashboard.inProgressTodos.map((t) => (
+              <p key={t.id} className="text-sm">
+                {t.title}
+                {t.dueDate ? `（期限: ${t.dueDate}）` : ''}
+              </p>
+            ))}
+          </DashboardWidget>
+
+          <DashboardWidget title="期限が近いToDo (7日以内)" empty="ありません">
+            {dashboard.nearDueTodos.map((t) => (
+              <p key={t.id} className="text-sm">
+                {t.title}（{t.dueDate}）
+              </p>
+            ))}
+          </DashboardWidget>
+
+          <DashboardWidget title="最新チャット (5件)" empty="ありません">
+            {dashboard.latestChat.map((m) => (
+              <p key={m.id} className="text-sm">
+                {m.body}
+              </p>
+            ))}
+          </DashboardWidget>
+
+          <DashboardWidget title="最新掲示板 (5件)" empty="ありません">
+            {dashboard.latestBoard.map((t) => (
+              <a
+                key={t.id}
+                href={`/projects/${project.id}/board/${t.id}`}
+                className="block text-sm text-blue-600 hover:underline"
+              >
+                {t.isPinned === 1 ? '📌 ' : ''}
+                {t.title}
+              </a>
+            ))}
+          </DashboardWidget>
+
+          <DashboardWidget title="最新メモ (5件)" empty="ありません">
+            {dashboard.latestNotes.map((n) => (
+              <a
+                key={n.id}
+                href={`/projects/${project.id}/notes/${n.id}`}
+                className="block text-sm text-blue-600 hover:underline"
+              >
+                {n.isPinned === 1 ? '📌 ' : ''}
+                {n.title}
+              </a>
+            ))}
+          </DashboardWidget>
+
+          <DashboardWidget title="最近のファイル (5件)" empty="ありません">
+            {dashboard.recentFiles.map((f) => (
+              <p key={f.id} className="text-sm">
+                {f.originalName}
+              </p>
+            ))}
+          </DashboardWidget>
+
+          <DashboardWidget title="次回ミーティング" empty="予定なし">
+            {dashboard.nextMeeting && (
+              <p className="text-sm">
+                {dashboard.nextMeeting.title}（{dashboard.nextMeeting.startAt}）
+              </p>
+            )}
+          </DashboardWidget>
+
+          <DashboardWidget title="マイルストーン進捗" empty="ありません">
+            {dashboard.milestones.map((m) => (
+              <div key={m.id}>
+                <p className="text-sm">
+                  {m.title} - {m.progress}%
+                </p>
+                <div className="h-1.5 w-full rounded bg-gray-200 dark:bg-gray-700">
+                  <div
+                    className="h-1.5 rounded bg-blue-500"
+                    style={{ width: `${m.progress}%` }}
+                  />
+                </div>
+              </div>
+            ))}
+          </DashboardWidget>
+
+          <DashboardWidget
+            title="最近のアクティビティ (10件)"
+            empty="ありません"
+          >
+            {dashboard.recentActivity.map((l) => (
+              <p key={l.id} className="text-sm">
+                {l.action}（{l.targetType}）
+              </p>
+            ))}
+          </DashboardWidget>
+        </div>
+      </main>
+    </div>
+  );
+}

app/projects/[projectId]/search/page.tsx

@@ -0,0 +1,99 @@
+import { redirect } from 'next/navigation';
+import { getCurrentUser, toPublicUser } from '@/lib/auth/getCurrentUser';
+import { createSearchService, createProjectService } from '@/lib/api/services';
+import { Header } from '@/components/layout/Header';
+import { ProjectNav } from '@/components/layout/ProjectNav';
+import { SearchForm } from '@/components/project/SearchForm';
+import { ForbiddenError, NotFoundError } from '@/lib/errors';
+
+export const dynamic = 'force-dynamic';
+
+const TYPE_LINKS: Record<string, (id: number, projectId: number) => string> = {
+  thread: (id, p) => `/projects/${p}/board/${id}`,
+  note: (id, p) => `/projects/${p}/notes/${id}`,
+  todo: (_id, p) => `/projects/${p}/todos`,
+  file: (id) => `/api/files/${id}/download`,
+  event: (_id, p) => `/projects/${p}/calendar`,
+  meeting: (_id, p) => `/projects/${p}/meetings`,
+  milestone: (_id, p) => `/projects/${p}/milestones`,
+  chat: (_id, p) => `/projects/${p}/chat`,
+};
+
+export default async function SearchPage({
+  params,
+  searchParams,
+}: {
+  params: Promise<{ projectId: string }>;
+  searchParams: Promise<{ q?: string; type?: string }>;
+}) {
+  const user = await getCurrentUser();
+  if (!user) redirect('/login');
+  const { projectId } = await params;
+  const { q, type } = await searchParams;
+
+  const projectService = createProjectService();
+  let project: Awaited<ReturnType<typeof projectService.getProject>>;
+  try {
+    project = projectService.getProject(user.id, Number(projectId));
+  } catch (error) {
+    if (error instanceof ForbiddenError || error instanceof NotFoundError) {
+      redirect('/dashboard');
+    }
+    throw error;
+  }
+
+  const searchService = createSearchService();
+  const results = q
+    ? searchService.search(user.id, project.id, {
+        q,
+        type: type as never,
+      })
+    : [];
+
+  return (
+    <div className="min-h-screen bg-gray-50 dark:bg-gray-900">
+      <Header user={toPublicUser(user)} />
+      <ProjectNav projectId={project.id} active="search" />
+      <main className="mx-auto max-w-3xl space-y-6 p-6">
+        <h1 className="text-2xl font-bold">検索</h1>
+        <SearchForm
+          projectId={project.id}
+          initialQ={q ?? ''}
+          initialType={type ?? ''}
+        />
+        <section className="space-y-2">
+          {q && results.length === 0 && (
+            <p className="text-sm text-gray-400 dark:text-gray-500">
+              該当する結果はありません。
+            </p>
+          )}
+          {results.map((r) => {
+            const href =
+              TYPE_LINKS[r.type]?.(r.id, project.id) ??
+              `/projects/${project.id}`;
+            return (
+              <a
+                key={`${r.type}-${r.id}`}
+                href={href}
+                className="block rounded border bg-white dark:bg-gray-800 p-3 shadow-sm hover:shadow-md"
+                data-testid={`search-result-${r.type}-${r.id}`}
+              >
+                <div className="flex items-center justify-between">
+                  <span className="font-medium text-gray-800 dark:text-gray-100">
+                    {r.title}
+                  </span>
+                  <span className="rounded bg-gray-100 dark:bg-gray-700 px-2 py-0.5 text-xs">
+                    {r.type}
+                  </span>
+                </div>
+                <p className="mt-1 text-xs text-gray-500 dark:text-gray-400">
+                  {r.snippet}
+                </p>
+              </a>
+            );
+          })}
+        </section>
+      </main>
+    </div>
+  );
+}

app/projects/[projectId]/settings/page.tsx

@@ -0,0 +1,57 @@
+import { redirect } from 'next/navigation';
+import { getCurrentUser, toPublicUser } from '@/lib/auth/getCurrentUser';
+import { createProjectService } from '@/lib/api/services';
+import { Header } from '@/components/layout/Header';
+import { ProjectNav } from '@/components/layout/ProjectNav';
+import { ProjectSettingsForm } from '@/components/project/ProjectSettingsForm';
+import { DeleteProjectButton } from '@/components/project/DeleteProjectButton';
+import { ForbiddenError, NotFoundError } from '@/lib/errors';
+
+export const dynamic = 'force-dynamic';
+
+export default async function ProjectSettingsPage({
+  params,
+}: {
+  params: Promise<{ projectId: string }>;
+}) {
+  const user = await getCurrentUser();
+  if (!user) {
+    redirect('/login');
+  }
+  const { projectId } = await params;
+
+  const service = createProjectService();
+  let project;
+  let canManage;
+  try {
+    project = service.getProject(user.id, Number(projectId));
+    canManage = service.getMemberRole(user.id, Number(projectId)) === 'admin';
+  } catch (error) {
+    if (error instanceof ForbiddenError || error instanceof NotFoundError) {
+      redirect('/dashboard');
+    }
+    throw error;
+  }
+
+  return (
+    <div className="min-h-screen bg-gray-50 dark:bg-gray-900">
+      <Header user={toPublicUser(user)} />
+      <ProjectNav projectId={project.id} active="settings" />
+      <main className="mx-auto max-w-2xl space-y-6 p-6">
+        <h1 className="text-2xl font-bold">プロジェクト設定</h1>
+        <div className="rounded-lg border bg-white dark:bg-gray-800 p-6 shadow-sm">
+          <ProjectSettingsForm project={project} canManage={canManage} />
+        </div>
+        {canManage && (
+          <div className="rounded-lg border border-red-200 bg-white dark:bg-gray-800 p-6 shadow-sm">
+            <h2 className="text-sm font-semibold text-red-700">危険操作</h2>
+            <p className="mt-1 text-sm text-gray-600 dark:text-gray-300">
+              プロジェクトを削除すると、関連データも削除されます。
+            </p>
+            <DeleteProjectButton projectId={project.id} />
+          </div>
+        )}
+      </main>
+    </div>
+  );
+}

app/projects/[projectId]/todos/page.tsx

@@ -0,0 +1,51 @@
+import { redirect } from 'next/navigation';
+import { getCurrentUser, toPublicUser } from '@/lib/auth/getCurrentUser';
+import { createTodoService, createProjectService } from '@/lib/api/services';
+import { Header } from '@/components/layout/Header';
+import { ProjectNav } from '@/components/layout/ProjectNav';
+import { KanbanBoard } from '@/components/todo/KanbanBoard';
+import { ForbiddenError, NotFoundError } from '@/lib/errors';
+
+export const dynamic = 'force-dynamic';
+
+export default async function TodosPage({
+  params,
+}: {
+  params: Promise<{ projectId: string }>;
+}) {
+  const user = await getCurrentUser();
+  if (!user) redirect('/login');
+  const { projectId } = await params;
+
+  const projectService = createProjectService();
+  let project: Awaited<ReturnType<typeof projectService.getProject>>;
+  try {
+    project = projectService.getProject(user.id, Number(projectId));
+  } catch (error) {
+    if (error instanceof ForbiddenError || error instanceof NotFoundError) {
+      redirect('/dashboard');
+    }
+    throw error;
+  }
+
+  const todoService = createTodoService();
+  const columns = todoService.getColumns(user.id, project.id);
+  const items = todoService.getItems(user.id, project.id);
+  const members = projectService.getMembers(user.id, project.id);
+
+  return (
+    <div className="min-h-screen bg-gray-50 dark:bg-gray-900">
+      <Header user={toPublicUser(user)} />
+      <ProjectNav projectId={project.id} active="todos" />
+      <main className="space-y-4 p-6">
+        <h1 className="text-2xl font-bold">ToDo / Kanban</h1>
+        <KanbanBoard
+          projectId={project.id}
+          columns={columns}
+          initialItems={items}
+          members={members}
+        />
+      </main>
+    </div>
+  );
+}

components/admin/BackupCreateButton.tsx

@@ -0,0 +1,47 @@
+'use client';
+
+import { useState } from 'react';
+import { useRouter } from 'next/navigation';
+
+export function BackupCreateButton() {
+  const router = useRouter();
+  const [loading, setLoading] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+
+  async function onCreate() {
+    setLoading(true);
+    setError(null);
+    const res = await fetch('/api/admin/backups', { method: 'POST' });
+    setLoading(false);
+    if (res.ok) {
+      router.refresh();
+    } else {
+      const b = (await res.json().catch(() => null)) as {
+        error?: { message?: string };
+      } | null;
+      setError(b?.error?.message ?? '作成に失敗しました');
+    }
+  }
+
+  return (
+    <div className="rounded-lg border bg-white dark:bg-gray-800 p-4 shadow-sm">
+      <p className="text-sm text-gray-600 dark:text-gray-300">
+        DBファイル + uploadsディレクトリをZIP化してバックアップを作成します。
+      </p>
+      <button
+        type="button"
+        onClick={onCreate}
+        disabled={loading}
+        className="mt-2 rounded bg-blue-600 px-4 py-2 font-medium text-white hover:bg-blue-700 disabled:opacity-50"
+        data-testid="create-backup"
+      >
+        {loading ? '作成中...' : 'バックアップ作成'}
+      </button>
+      {error && (
+        <p className="mt-2 text-sm text-red-600" role="alert">
+          {error}
+        </p>
+      )}
+    </div>
+  );
+}

components/board/CommentForm.tsx

@@ -0,0 +1,76 @@
+'use client';
+
+import { useRef, useState, type FormEvent } from 'react';
+import { useRouter } from 'next/navigation';
+import { AttachmentPicker } from '@/components/files/AttachmentPicker';
+import type { AttachmentPickerHandle } from '@/components/files/AttachmentPicker';
+
+export function CommentForm({
+  projectId,
+  threadId,
+}: {
+  projectId: number;
+  threadId: number;
+}) {
+  const router = useRouter();
+  const pickerRef = useRef<AttachmentPickerHandle>(null);
+  const [bodyMd, setBodyMd] = useState('');
+  const [loading, setLoading] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+  const [pickerLoading, setPickerLoading] = useState(false);
+
+  async function onSubmit(event: FormEvent<HTMLFormElement>) {
+    event.preventDefault();
+    setLoading(true);
+    setError(null);
+    const fileIds = pickerRef.current?.getFileIds() ?? [];
+    const res = await fetch(
+      `/api/projects/${projectId}/board/threads/${threadId}/comments`,
+      {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ bodyMd, fileIds }),
+      }
+    );
+    setLoading(false);
+    if (res.ok) {
+      setBodyMd('');
+      pickerRef.current?.clear();
+      router.refresh();
+    } else {
+      const b = (await res.json().catch(() => null)) as {
+        error?: { message?: string };
+      } | null;
+      setError(b?.error?.message ?? '投稿に失敗しました');
+    }
+  }
+
+  return (
+    <form onSubmit={onSubmit} className="space-y-2">
+      <textarea
+        placeholder="コメント（Markdown）"
+        value={bodyMd}
+        onChange={(e) => setBodyMd(e.target.value)}
+        className="min-h-[80px] w-full rounded border px-3 py-2"
+        required
+      />
+      <AttachmentPicker
+        ref={pickerRef}
+        projectId={projectId}
+        onLoadingChange={setPickerLoading}
+      />
+      {error && (
+        <p className="text-sm text-red-600" role="alert">
+          {error}
+        </p>
+      )}
+      <button
+        type="submit"
+        disabled={loading || pickerLoading}
+        className="rounded bg-blue-600 px-4 py-2 text-sm font-medium text-white hover:bg-blue-700 disabled:opacity-50"
+      >
+        {loading ? '投稿中...' : 'コメント投稿'}
+      </button>
+    </form>
+  );
+}

components/board/MarkdownBody.tsx

@@ -0,0 +1,20 @@
+import ReactMarkdown from 'react-markdown';
+import remarkGfm from 'remark-gfm';
+import rehypeSanitize from 'rehype-sanitize';
+
+/**
+ * Markdown本文を安全にレンダリングする。
+ * HTML直接入力は無効化し、rehype-sanitize でサニタイズする。
+ */
+export function MarkdownBody({ bodyMd }: { bodyMd: string }) {
+  return (
+    <div className="prose prose-sm max-w-none">
+      <ReactMarkdown
+        remarkPlugins={[remarkGfm]}
+        rehypePlugins={[rehypeSanitize]}
+      >
+        {bodyMd}
+      </ReactMarkdown>
+    </div>
+  );
+}

components/board/ThreadForm.tsx

@@ -0,0 +1,111 @@
+'use client';
+
+import { useRef, useState, type FormEvent } from 'react';
+import { useRouter } from 'next/navigation';
+import { AttachmentPicker } from '@/components/files/AttachmentPicker';
+import type { AttachmentPickerHandle } from '@/components/files/AttachmentPicker';
+
+const CATEGORIES = [
+  { value: '', label: 'なし' },
+  { value: 'notice', label: 'notice' },
+  { value: 'spec', label: 'spec' },
+  { value: 'minutes', label: 'minutes' },
+  { value: 'question', label: 'question' },
+  { value: 'decision', label: 'decision' },
+  { value: 'trouble', label: 'trouble' },
+  { value: 'memo', label: 'memo' },
+] as const;
+
+export function ThreadForm({ projectId }: { projectId: number }) {
+  const router = useRouter();
+  const pickerRef = useRef<AttachmentPickerHandle>(null);
+  const [title, setTitle] = useState('');
+  const [bodyMd, setBodyMd] = useState('');
+  const [category, setCategory] = useState('');
+  const [error, setError] = useState<string | null>(null);
+  const [loading, setLoading] = useState(false);
+  const [pickerLoading, setPickerLoading] = useState(false);
+
+  async function onSubmit(event: FormEvent<HTMLFormElement>) {
+    event.preventDefault();
+    setLoading(true);
+    setError(null);
+    const fileIds = pickerRef.current?.getFileIds() ?? [];
+    const res = await fetch(`/api/projects/${projectId}/board/threads`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({
+        title,
+        bodyMd,
+        category: category || undefined,
+        fileIds,
+      }),
+    });
+    setLoading(false);
+    if (res.ok) {
+      const data = (await res.json()) as { thread: { id: number } };
+      pickerRef.current?.clear();
+      router.push(`/projects/${projectId}/board/${data.thread.id}`);
+      router.refresh();
+    } else {
+      const b = (await res.json().catch(() => null)) as {
+        error?: { message?: string };
+      } | null;
+      setError(b?.error?.message ?? '作成に失敗しました');
+    }
+  }
+
+  return (
+    <form
+      onSubmit={onSubmit}
+      className="space-y-3 rounded-lg border bg-white dark:bg-gray-800 p-4 shadow-sm"
+    >
+      <div className="flex gap-2">
+        <input
+          type="text"
+          placeholder="タイトル"
+          value={title}
+          onChange={(e) => setTitle(e.target.value)}
+          className="flex-1 rounded border px-3 py-2"
+          required
+          maxLength={200}
+        />
+        <select
+          value={category}
+          onChange={(e) => setCategory(e.target.value)}
+          className="rounded border px-2 py-2"
+        >
+          {CATEGORIES.map((c) => (
+            <option key={c.value} value={c.value}>
+              {c.label}
+            </option>
+          ))}
+        </select>
+      </div>
+      <textarea
+        placeholder="本文（Markdown）"
+        value={bodyMd}
+        onChange={(e) => setBodyMd(e.target.value)}
+        className="min-h-[120px] w-full rounded border px-3 py-2"
+        required
+      />
+      <AttachmentPicker
+        ref={pickerRef}
+        projectId={projectId}
+        onLoadingChange={setPickerLoading}
+      />
+      {error && (
+        <p className="text-sm text-red-600" role="alert">
+          {error}
+        </p>
+      )}
+      <button
+        type="submit"
+        disabled={loading || pickerLoading}
+        className="rounded bg-blue-600 px-4 py-2 font-medium text-white hover:bg-blue-700 disabled:opacity-50"
+      >
+        {loading ? '作成中...' : 'スレッド作成'}
+      </button>
+    </form>
+  );
+}

components/calendar/CalendarEventForm.tsx

@@ -0,0 +1,78 @@
+'use client';
+
+import { useState, type FormEvent } from 'react';
+import { useRouter } from 'next/navigation';
+
+export function CalendarEventForm({
+  projectId,
+  defaultDate,
+}: {
+  projectId: number;
+  defaultDate: string;
+}) {
+  const router = useRouter();
+  const [title, setTitle] = useState('');
+  const [startAt, setStartAt] = useState(`${defaultDate}T10:00:00`);
+  const [loading, setLoading] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+
+  async function onSubmit(event: FormEvent<HTMLFormElement>) {
+    event.preventDefault();
+    setLoading(true);
+    setError(null);
+    const res = await fetch(`/api/projects/${projectId}/calendar/events`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ title, type: 'custom', startAt }),
+    });
+    setLoading(false);
+    if (res.ok) {
+      setTitle('');
+      router.refresh();
+    } else {
+      const b = (await res.json().catch(() => null)) as {
+        error?: { message?: string };
+      } | null;
+      setError(b?.error?.message ?? '作成に失敗しました');
+    }
+  }
+
+  return (
+    <form
+      onSubmit={onSubmit}
+      className="flex flex-col gap-2 rounded-lg border bg-white dark:bg-gray-800 p-4 shadow-sm sm:flex-row sm:items-end"
+    >
+      <div className="flex-1">
+        <label className="block text-sm font-medium">イベント名</label>
+        <input
+          type="text"
+          value={title}
+          onChange={(e) => setTitle(e.target.value)}
+          className="mt-1 w-full rounded border px-3 py-2"
+          required
+        />
+      </div>
+      <div>
+        <label className="block text-sm font-medium">開始日時</label>
+        <input
+          type="datetime-local"
+          value={startAt}
+          onChange={(e) => setStartAt(e.target.value)}
+          className="mt-1 rounded border px-3 py-2"
+        />
+      </div>
+      <button
+        type="submit"
+        disabled={loading}
+        className="rounded bg-blue-600 px-4 py-2 font-medium text-white hover:bg-blue-700 disabled:opacity-50"
+      >
+        {loading ? '作成中...' : 'イベント作成'}
+      </button>
+      {error && (
+        <p className="text-sm text-red-600" role="alert">
+          {error}
+        </p>
+      )}
+    </form>
+  );
+}

components/calendar/CalendarView.tsx

@@ -0,0 +1,185 @@
+'use client';
+
+import { useState } from 'react';
+import { useRouter } from 'next/navigation';
+import type { CalendarEventView } from '@/services/ScheduleService';
+import {
+  getMonthGrid,
+  getWeekDays,
+  parseISODate,
+  stepAnchor,
+  toISODate,
+  eventsOnDay,
+  type CalendarViewMode,
+} from '@/lib/calendar/grid';
+import { WEEKDAY_LABELS } from '@/components/calendar/sourceColors';
+import { MonthView } from '@/components/calendar/MonthView';
+import { WeekView } from '@/components/calendar/WeekView';
+import { DayView } from '@/components/calendar/DayView';
+import { EventDetailDialog } from '@/components/calendar/EventDetailDialog';
+
+const VIEW_LABELS: { mode: CalendarViewMode; label: string }[] = [
+  { mode: 'month', label: '月' },
+  { mode: 'week', label: '週' },
+  { mode: 'day', label: '日' },
+];
+
+/**
+ * カレンダーUIのクライアントコンテナ。
+ * 表示モード切替・前/次/今日ナビ・詳細ダイアログを管理し、
+ * データ取得はURL searchParams経由でServer Componentに委ねる。
+ */
+export function CalendarView({
+  projectId,
+  events,
+  view,
+  anchorDate,
+  todayKey,
+}: {
+  projectId: number;
+  events: CalendarEventView[];
+  view: CalendarViewMode;
+  anchorDate: string;
+  todayKey: string;
+}) {
+  const router = useRouter();
+  const [selectedDateKey, setSelectedDateKey] = useState<string | null>(null);
+  const anchor = parseISODate(anchorDate);
+
+  function navigate(nextView: CalendarViewMode, nextAnchor: Date) {
+    const params = new URLSearchParams({
+      view: nextView,
+      date: toISODate(nextAnchor),
+    });
+    router.push(`/projects/${projectId}/calendar?${params.toString()}`);
+  }
+
+  function changeView(nextView: CalendarViewMode) {
+    navigate(nextView, anchor);
+  }
+
+  function goPrev() {
+    navigate(view, stepAnchor(view, anchor, -1));
+  }
+
+  function goNext() {
+    navigate(view, stepAnchor(view, anchor, 1));
+  }
+
+  function goToday() {
+    navigate(view, new Date());
+  }
+
+  function openDetail(dateKey: string) {
+    setSelectedDateKey(dateKey);
+  }
+
+  const title = buildTitle(view, anchor);
+
+  return (
+    <div className="space-y-4">
+      <div className="flex flex-wrap items-center justify-between gap-2">
+        <h2
+          className="text-xl font-bold text-gray-800 dark:text-gray-100"
+          data-testid="calendar-title"
+        >
+          {title}
+        </h2>
+        <div className="flex items-center gap-2">
+          <div className="flex overflow-hidden rounded border">
+            {VIEW_LABELS.map((v) => (
+              <button
+                key={v.mode}
+                type="button"
+                onClick={() => changeView(v.mode)}
+                className={`px-3 py-1 text-sm ${
+                  view === v.mode
+                    ? 'bg-blue-600 text-white'
+                    : 'bg-white dark:bg-gray-800 text-gray-600 dark:text-gray-300 hover:bg-gray-100 dark:hover:bg-gray-700'
+                }`}
+                data-testid={`calendar-view-${v.mode}`}
+              >
+                {v.label}
+              </button>
+            ))}
+          </div>
+          <div className="flex items-center gap-1">
+            <button
+              type="button"
+              onClick={goPrev}
+              className="rounded border bg-white dark:bg-gray-800 px-2 py-1 text-sm text-gray-600 dark:text-gray-300 hover:bg-gray-100 dark:hover:bg-gray-700"
+              aria-label="前へ"
+              data-testid="calendar-prev"
+            >
+              ‹
+            </button>
+            <button
+              type="button"
+              onClick={goToday}
+              className="rounded border bg-white dark:bg-gray-800 px-3 py-1 text-sm text-gray-600 dark:text-gray-300 hover:bg-gray-100 dark:hover:bg-gray-700"
+              data-testid="calendar-today"
+            >
+              今日
+            </button>
+            <button
+              type="button"
+              onClick={goNext}
+              className="rounded border bg-white dark:bg-gray-800 px-2 py-1 text-sm text-gray-600 dark:text-gray-300 hover:bg-gray-100 dark:hover:bg-gray-700"
+              aria-label="次へ"
+              data-testid="calendar-next"
+            >
+              ›
+            </button>
+          </div>
+        </div>
+      </div>
+
+      {view === 'month' && (
+        <MonthView
+          events={events}
+          weeks={getMonthGrid(anchor.getFullYear(), anchor.getMonth())}
+          anchorMonth={anchor.getMonth()}
+          todayKey={todayKey}
+          onSelectDate={openDetail}
+        />
+      )}
+      {view === 'week' && (
+        <WeekView
+          events={events}
+          days={getWeekDays(anchor)}
+          todayKey={todayKey}
+          onSelectDate={openDetail}
+        />
+      )}
+      {view === 'day' && (
+        <DayView
+          day={anchor}
+          events={events}
+          todayKey={todayKey}
+          onSelectDate={openDetail}
+        />
+      )}
+
+      {selectedDateKey && (
+        <EventDetailDialog
+          date={parseISODate(selectedDateKey)}
+          events={eventsOnDay(events, selectedDateKey)}
+          onClose={() => setSelectedDateKey(null)}
+        />
+      )}
+    </div>
+  );
+}
+
+function buildTitle(view: CalendarViewMode, anchor: Date): string {
+  if (view === 'month') {
+    return `${anchor.getFullYear()}年${anchor.getMonth() + 1}月`;
+  }
+  if (view === 'week') {
+    const days = getWeekDays(anchor);
+    const s = days[0];
+    const e = days[6];
+    return `${s.getFullYear()}年${s.getMonth() + 1}月${s.getDate()}日 〜 ${e.getMonth() + 1}月${e.getDate()}日`;
+  }
+  return `${anchor.getFullYear()}年${anchor.getMonth() + 1}月${anchor.getDate()}日(${WEEKDAY_LABELS[anchor.getDay()]})`;
+}

components/calendar/DayView.tsx

@@ -0,0 +1,125 @@
+'use client';
+
+import type { CalendarEventView } from '@/services/ScheduleService';
+import {
+  eventsOnDay,
+  eventHour,
+  formatTime,
+  getDayHours,
+  toISODate,
+} from '@/lib/calendar/grid';
+import {
+  SOURCE_COLORS,
+  SOURCE_CHIP_BORDER,
+  WEEKDAY_LABELS,
+} from '@/components/calendar/sourceColors';
+
+/**
+ * 日表示(時間グリッド)。0:00〜23:00 を1時間刻みで表示し、
+ * 時刻付きイベントを該当時刻行に、終日(日付のみ)イベントを上部に配置する。
+ */
+export function DayView({
+  day,
+  events,
+  todayKey,
+  onSelectDate,
+}: {
+  day: Date;
+  events: CalendarEventView[];
+  todayKey: string;
+  onSelectDate: (dateKey: string) => void;
+}) {
+  const key = toISODate(day);
+  const dayEvents = eventsOnDay(events, key);
+  const allDay = dayEvents.filter((e) => eventHour(e.startAt) === null);
+  const timed = dayEvents.filter((e) => eventHour(e.startAt) !== null);
+  const hours = getDayHours();
+  const isToday = key === todayKey;
+
+  return (
+    <div className="rounded-lg border bg-white dark:bg-gray-800">
+      <div className="flex items-center justify-between border-b p-3">
+        <button
+          type="button"
+          onClick={() => onSelectDate(key)}
+          className="text-left"
+        >
+          <p className="text-lg font-bold text-gray-800 dark:text-gray-100">
+            {day.getMonth() + 1}月{day.getDate()}日(
+            {WEEKDAY_LABELS[day.getDay()]})
+          </p>
+        </button>
+        {isToday && (
+          <span className="rounded bg-blue-100 px-2 py-0.5 text-xs text-blue-700">
+            今日
+          </span>
+        )}
+      </div>
+
+      {allDay.length > 0 && (
+        <div
+          className="border-b bg-gray-50 dark:bg-gray-900 p-2"
+          data-testid="calendar-all-day-section"
+        >
+          <p className="mb-1 text-xs font-medium text-gray-500 dark:text-gray-400">
+            終日
+          </p>
+          <div className="flex flex-wrap gap-1">
+            {allDay.map((e) => (
+              <button
+                key={e.key}
+                type="button"
+                onClick={() => onSelectDate(key)}
+                title={e.title}
+                className={`max-w-full truncate rounded border px-2 py-0.5 text-xs ${
+                  SOURCE_COLORS[e.source] ??
+                  'bg-gray-100 dark:bg-gray-700 text-gray-600 dark:text-gray-300'
+                } ${SOURCE_CHIP_BORDER[e.source] ?? 'border-gray-200 dark:border-gray-700'}`}
+                data-testid={`calendar-event-${e.key}`}
+              >
+                {e.title}
+              </button>
+            ))}
+          </div>
+        </div>
+      )}
+
+      <div className="max-h-[600px] overflow-y-auto">
+        {hours.map((h) => {
+          const hourEvents = timed.filter((e) => eventHour(e.startAt) === h);
+          return (
+            <div
+              key={h}
+              className="flex border-b last:border-b-0"
+              data-testid={`calendar-hour-${String(h).padStart(2, '0')}`}
+            >
+              <div className="w-16 shrink-0 border-r bg-gray-50 dark:bg-gray-900 p-1 text-right text-xs text-gray-400 dark:text-gray-500">
+                {String(h).padStart(2, '0')}:00
+              </div>
+              <div className="flex-1 p-1">
+                {hourEvents.map((e) => (
+                  <button
+                    key={e.key}
+                    type="button"
+                    onClick={() => onSelectDate(key)}
+                    title={e.title}
+                    className={`mb-1 block w-full truncate rounded border px-2 py-1 text-left text-xs ${
+                      SOURCE_COLORS[e.source] ??
+                      'bg-gray-100 dark:bg-gray-700 text-gray-600 dark:text-gray-300'
+                    } ${SOURCE_CHIP_BORDER[e.source] ?? 'border-gray-200 dark:border-gray-700'}`}
+                    data-testid={`calendar-event-${e.key}`}
+                  >
+                    <span className="font-mono text-[10px] opacity-70">
+                      {formatTime(e.startAt)}
+                    </span>{' '}
+                    {e.title}
+                  </button>
+                ))}
+              </div>
+            </div>
+          );
+        })}
+      </div>
+    </div>
+  );
+}

components/calendar/EventDetailDialog.tsx

@@ -0,0 +1,116 @@
+'use client';
+
+import { useEffect, useRef } from 'react';
+import type { CalendarEventView } from '@/services/ScheduleService';
+import { formatTime } from '@/lib/calendar/grid';
+import {
+  SOURCE_COLORS,
+  SOURCE_LABELS,
+} from '@/components/calendar/sourceColors';
+
+/**
+ * 指定日のイベント詳細ダイアログ。
+ * セル内ではtruncateされるタイトルも、ここでは全文と説明を表示する。
+ * 開閉時にフォーカスをダイアログへ移し、閉じたら元の要素へ戻す。
+ */
+export function EventDetailDialog({
+  date,
+  events,
+  onClose,
+}: {
+  date: Date;
+  events: CalendarEventView[];
+  onClose: () => void;
+}) {
+  const dialogRef = useRef<HTMLDivElement>(null);
+
+  useEffect(() => {
+    const previouslyFocused = document.activeElement as HTMLElement | null;
+    dialogRef.current?.focus();
+    return () => {
+      previouslyFocused?.focus?.();
+    };
+  }, []);
+
+  useEffect(() => {
+    function onKey(e: KeyboardEvent) {
+      if (e.key === 'Escape') onClose();
+    }
+    window.addEventListener('keydown', onKey);
+    return () => window.removeEventListener('keydown', onKey);
+  }, [onClose]);
+
+  const dateLabel = `${date.getFullYear()}年${date.getMonth() + 1}月${date.getDate()}日`;
+
+  return (
+    <div
+      className="fixed inset-0 z-50 flex items-start justify-center bg-black/40 p-4"
+      onClick={onClose}
+      data-testid="calendar-detail-backdrop"
+    >
+      <div
+        ref={dialogRef}
+        tabIndex={-1}
+        className="mt-16 w-full max-w-lg rounded-lg bg-white dark:bg-gray-800 shadow-xl focus:outline-none"
+        onClick={(e) => e.stopPropagation()}
+        role="dialog"
+        aria-modal="true"
+        aria-label={`${dateLabel}のイベント`}
+        data-testid="calendar-detail-dialog"
+      >
+        <div className="flex items-center justify-between border-b p-4">
+          <h2 className="text-lg font-bold text-gray-800 dark:text-gray-100">
+            {dateLabel}
+          </h2>
+          <button
+            type="button"
+            onClick={onClose}
+            className="rounded p-1 text-gray-400 dark:text-gray-500 hover:bg-gray-100 dark:hover:bg-gray-700 hover:text-gray-600"
+            aria-label="閉じる"
+            data-testid="calendar-detail-close"
+          >
+            ×
+          </button>
+        </div>
+        <div className="max-h-[60vh] space-y-3 overflow-y-auto p-4">
+          {events.length === 0 ? (
+            <p className="text-sm text-gray-400 dark:text-gray-500">
+              この日のイベントはありません。
+            </p>
+          ) : (
+            events.map((e) => (
+              <div
+                key={e.key}
+                className="rounded border border-gray-200 dark:border-gray-700 p-3"
+                data-testid={`calendar-detail-${e.key}`}
+              >
+                <div className="flex items-center justify-between gap-2">
+                  <p className="font-medium text-gray-800 dark:text-gray-100 break-words">
+                    {e.title}
+                  </p>
+                  <span
+                    className={`shrink-0 rounded px-2 py-0.5 text-xs ${
+                      SOURCE_COLORS[e.source] ??
+                      'bg-gray-100 dark:bg-gray-700 text-gray-600 dark:text-gray-300'
+                    }`}
+                  >
+                    {SOURCE_LABELS[e.source] ?? e.source}
+                  </span>
+                </div>
+                <p className="mt-1 text-xs text-gray-500 dark:text-gray-400">
+                  {formatTime(e.startAt)}
+                  {e.endAt ? ` 〜 ${formatTime(e.endAt)}` : ''}
+                </p>
+                {e.description && (
+                  <p className="mt-2 whitespace-pre-wrap text-sm text-gray-600 dark:text-gray-300">
+                    {e.description}
+                  </p>
+                )}
+              </div>
+            ))
+          )}
+        </div>
+      </div>
+    </div>
+  );
+}

components/calendar/MilestoneForm.tsx

@@ -0,0 +1,73 @@
+'use client';
+
+import { useState, type FormEvent } from 'react';
+import { useRouter } from 'next/navigation';
+
+export function MilestoneForm({ projectId }: { projectId: number }) {
+  const router = useRouter();
+  const [title, setTitle] = useState('');
+  const [dueDate, setDueDate] = useState('');
+  const [loading, setLoading] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+
+  async function onSubmit(event: FormEvent<HTMLFormElement>) {
+    event.preventDefault();
+    setLoading(true);
+    setError(null);
+    const res = await fetch(`/api/projects/${projectId}/milestones`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ title, dueDate: dueDate || null }),
+    });
+    setLoading(false);
+    if (res.ok) {
+      setTitle('');
+      setDueDate('');
+      router.refresh();
+    } else {
+      const b = (await res.json().catch(() => null)) as {
+        error?: { message?: string };
+      } | null;
+      setError(b?.error?.message ?? '作成に失敗しました');
+    }
+  }
+
+  return (
+    <form
+      onSubmit={onSubmit}
+      className="flex flex-col gap-2 rounded-lg border bg-white dark:bg-gray-800 p-4 shadow-sm sm:flex-row sm:items-end"
+    >
+      <div className="flex-1">
+        <label className="block text-sm font-medium">マイルストーン名</label>
+        <input
+          type="text"
+          value={title}
+          onChange={(e) => setTitle(e.target.value)}
+          className="mt-1 w-full rounded border px-3 py-2"
+          required
+        />
+      </div>
+      <div>
+        <label className="block text-sm font-medium">期限</label>
+        <input
+          type="date"
+          value={dueDate}
+          onChange={(e) => setDueDate(e.target.value)}
+          className="mt-1 rounded border px-3 py-2"
+        />
+      </div>
+      <button
+        type="submit"
+        disabled={loading}
+        className="rounded bg-blue-600 px-4 py-2 font-medium text-white hover:bg-blue-700 disabled:opacity-50"
+      >
+        {loading ? '作成中...' : 'マイルストーン作成'}
+      </button>
+      {error && (
+        <p className="text-sm text-red-600" role="alert">
+          {error}
+        </p>
+      )}
+    </form>
+  );
+}

components/calendar/MonthView.tsx

@@ -0,0 +1,108 @@
+'use client';
+
+import type { CalendarEventView } from '@/services/ScheduleService';
+import { eventsOnDay, toISODate } from '@/lib/calendar/grid';
+import {
+  SOURCE_COLORS,
+  SOURCE_CHIP_BORDER,
+  WEEKDAY_LABELS,
+} from '@/components/calendar/sourceColors';
+
+const MAX_VISIBLE_CHIPS = 3;
+
+/**
+ * 月表示グリッド。日曜始まりの7列グリッドで各日にイベントチップを表示する。
+ * 長いタイトルは truncate し、3件を超える分は「+N件」でまとめる。
+ */
+export function MonthView({
+  events,
+  weeks,
+  anchorMonth,
+  todayKey,
+  onSelectDate,
+}: {
+  events: CalendarEventView[];
+  weeks: Date[][];
+  anchorMonth: number;
+  todayKey: string;
+  onSelectDate: (dateKey: string) => void;
+}) {
+  return (
+    <div className="overflow-hidden rounded-lg border bg-white dark:bg-gray-800">
+      <div className="grid grid-cols-7 border-b bg-gray-50 dark:bg-gray-900 text-center text-xs font-medium text-gray-500 dark:text-gray-400">
+        {WEEKDAY_LABELS.map((w) => (
+          <div key={w} className="py-2">
+            {w}
+          </div>
+        ))}
+      </div>
+      <div>
+        {weeks.map((week, wi) => (
+          <div key={wi} className="grid grid-cols-7 border-b last:border-b-0">
+            {week.map((day) => {
+              const key = toISODate(day);
+              const dayEvents = eventsOnDay(events, key);
+              const inMonth = day.getMonth() === anchorMonth;
+              const isToday = key === todayKey;
+              const visible = dayEvents.slice(0, MAX_VISIBLE_CHIPS);
+              const hidden = dayEvents.length - visible.length;
+              return (
+                <div
+                  key={key}
+                  className={`min-h-[110px] border-r border-t p-1 last:border-r-0 ${
+                    inMonth
+                      ? 'bg-white dark:bg-gray-800'
+                      : 'bg-gray-50 dark:bg-gray-900'
+                  }`}
+                  data-testid={`calendar-day-${key}`}
+                >
+                  <button
+                    type="button"
+                    onClick={() => onSelectDate(key)}
+                    className={`flex h-6 w-6 items-center justify-center rounded-full text-xs ${
+                      isToday
+                        ? 'bg-blue-600 font-bold text-white'
+                        : inMonth
+                          ? 'text-gray-700 dark:text-gray-200 hover:bg-gray-100 dark:hover:bg-gray-700'
+                          : 'text-gray-300 dark:text-gray-600 hover:bg-gray-100 dark:hover:bg-gray-700'
+                    }`}
+                    aria-label={`${key} の詳細を開く`}
+                  >
+                    {day.getDate()}
+                  </button>
+                  <div className="mt-1 space-y-0.5">
+                    {visible.map((e) => (
+                      <button
+                        key={e.key}
+                        type="button"
+                        onClick={() => onSelectDate(key)}
+                        title={e.title}
+                        className={`block w-full truncate rounded border px-1 text-left text-xs ${
+                          SOURCE_COLORS[e.source] ??
+                          'bg-gray-100 dark:bg-gray-700 text-gray-600 dark:text-gray-300'
+                        } ${SOURCE_CHIP_BORDER[e.source] ?? 'border-gray-200 dark:border-gray-700'}`}
+                        data-testid={`calendar-event-${e.key}`}
+                      >
+                        {e.title}
+                      </button>
+                    ))}
+                    {hidden > 0 && (
+                      <button
+                        type="button"
+                        onClick={() => onSelectDate(key)}
+                        aria-label={`${key}の残り${hidden}件を開く`}
+                        className="block w-full truncate text-left text-xs text-gray-400 dark:text-gray-500 hover:text-gray-600"
+                      >
+                        +{hidden}件
+                      </button>
+                    )}
+                  </div>
+                </div>
+              );
+            })}
+          </div>
+        ))}
+      </div>
+    </div>
+  );
+}

components/calendar/WeekView.tsx

@@ -0,0 +1,96 @@
+'use client';
+
+import type { CalendarEventView } from '@/services/ScheduleService';
+import { eventsOnDay, formatTime, toISODate } from '@/lib/calendar/grid';
+import {
+  SOURCE_COLORS,
+  SOURCE_CHIP_BORDER,
+  WEEKDAY_LABELS,
+} from '@/components/calendar/sourceColors';
+
+/**
+ * 週表示。日〜土の7日を並べ、各日のイベントを開始時刻付きで表示する。
+ */
+export function WeekView({
+  events,
+  days,
+  todayKey,
+  onSelectDate,
+}: {
+  events: CalendarEventView[];
+  days: Date[];
+  todayKey: string;
+  onSelectDate: (dateKey: string) => void;
+}) {
+  return (
+    <div className="overflow-hidden rounded-lg border bg-white dark:bg-gray-800">
+      <div className="grid grid-cols-7 border-b bg-gray-50 dark:bg-gray-900 text-center text-xs font-medium text-gray-500 dark:text-gray-400">
+        {days.map((d) => {
+          const key = toISODate(d);
+          return (
+            <button
+              key={key}
+              type="button"
+              onClick={() => onSelectDate(key)}
+              className="py-2 hover:bg-gray-100 dark:hover:bg-gray-700"
+              data-testid={`calendar-weekday-${key}`}
+            >
+              <div className="text-gray-500 dark:text-gray-400">
+                {WEEKDAY_LABELS[d.getDay()]}
+              </div>
+              <div
+                className={`mt-0.5 inline-flex h-6 w-6 items-center justify-center rounded-full text-sm ${
+                  key === todayKey
+                    ? 'bg-blue-600 font-bold text-white'
+                    : 'text-gray-700 dark:text-gray-200'
+                }`}
+              >
+                {d.getDate()}
+              </div>
+            </button>
+          );
+        })}
+      </div>
+      <div className="grid grid-cols-7">
+        {days.map((d) => {
+          const key = toISODate(d);
+          const dayEvents = eventsOnDay(events, key);
+          return (
+            <div
+              key={key}
+              className="min-h-[400px] border-r p-1 last:border-r-0"
+              data-testid={`calendar-week-cell-${key}`}
+            >
+              <div className="space-y-1">
+                {dayEvents.length === 0 ? (
+                  <p className="px-1 py-1 text-xs text-gray-300 dark:text-gray-600">
+                    -
+                  </p>
+                ) : (
+                  dayEvents.map((e) => (
+                    <button
+                      key={e.key}
+                      type="button"
+                      onClick={() => onSelectDate(key)}
+                      title={e.title}
+                      className={`block w-full truncate rounded border px-1 py-0.5 text-left text-xs ${
+                        SOURCE_COLORS[e.source] ??
+                        'bg-gray-100 dark:bg-gray-700 text-gray-600 dark:text-gray-300'
+                      } ${SOURCE_CHIP_BORDER[e.source] ?? 'border-gray-200 dark:border-gray-700'}`}
+                      data-testid={`calendar-event-${e.key}`}
+                    >
+                      <span className="font-mono text-[10px] opacity-70">
+                        {formatTime(e.startAt)}
+                      </span>{' '}
+                      {e.title}
+                    </button>
+                  ))
+                )}
+              </div>
+            </div>
+          );
+        })}
+      </div>
+    </div>
+  );
+}

components/calendar/sourceColors.ts

@@ -0,0 +1,28 @@
+/** カレンダーイベントの来源ごとの色とラベル。 */
+export const SOURCE_COLORS: Record<string, string> = {
+  event: 'bg-blue-100 text-blue-700',
+  milestone: 'bg-purple-100 text-purple-700',
+  todo: 'bg-yellow-100 text-yellow-700',
+};
+
+export const SOURCE_CHIP_BORDER: Record<string, string> = {
+  event: 'border-blue-200',
+  milestone: 'border-purple-200',
+  todo: 'border-yellow-200',
+};
+
+export const SOURCE_LABELS: Record<string, string> = {
+  event: 'イベント',
+  milestone: 'マイルストーン',
+  todo: 'ToDo',
+};
+
+export const WEEKDAY_LABELS = [
+  '日',
+  '月',
+  '火',
+  '水',
+  '木',
+  '金',
+  '土',
+] as const;

components/chat/ChatWindow.tsx

@@ -0,0 +1,175 @@
+'use client';
+
+import { useEffect, useRef, useState, type FormEvent } from 'react';
+import type { ChatMessageWithAttachments } from '@/lib/types';
+import { AttachmentPicker } from '@/components/files/AttachmentPicker';
+import type { AttachmentPickerHandle } from '@/components/files/AttachmentPicker';
+import { AttachmentList } from '@/components/files/AttachmentList';
+
+interface ChatWindowProps {
+  projectId: number;
+  userName: string;
+}
+
+export function ChatWindow({ projectId, userName }: ChatWindowProps) {
+  const [messages, setMessages] = useState<ChatMessageWithAttachments[]>([]);
+  const [input, setInput] = useState('');
+  const [error, setError] = useState<string | null>(null);
+  const [sending, setSending] = useState(false);
+  const [pickerLoading, setPickerLoading] = useState(false);
+  const pickerRef = useRef<AttachmentPickerHandle>(null);
+
+  // 履歴取得
+  useEffect(() => {
+    fetch(`/api/projects/${projectId}/chat/messages`)
+      .then((res) => (res.ok ? res.json() : null))
+      .then((data) => {
+        if (data?.items)
+          setMessages(data.items as ChatMessageWithAttachments[]);
+      })
+      .catch(() => undefined);
+  }, [projectId]);
+
+  // SSE接続(自動再接続はEventSourceが行う)
+  useEffect(() => {
+    const es = new EventSource(`/api/projects/${projectId}/chat/stream`);
+    es.onmessage = (event) => {
+      try {
+        const parsed = JSON.parse(event.data) as {
+          type: string;
+          data: {
+            message?: ChatMessageWithAttachments;
+            id?: number;
+          };
+        };
+        if (parsed.type === 'chat.message.created' && parsed.data.message) {
+          setMessages((prev) =>
+            prev.some((m) => m.id === parsed.data.message!.id)
+              ? prev
+              : [parsed.data.message!, ...prev]
+          );
+        } else if (
+          parsed.type === 'chat.message.updated' &&
+          parsed.data.message
+        ) {
+          // 編集イベントは本文のみ更新し、添付は既存のものを保持する
+          setMessages((prev) =>
+            prev.map((m) =>
+              m.id === parsed.data.message!.id
+                ? { ...m, ...parsed.data.message!, attachments: m.attachments }
+                : m
+            )
+          );
+        } else if (parsed.type === 'chat.message.deleted' && parsed.data.id) {
+          setMessages((prev) => prev.filter((m) => m.id !== parsed.data.id));
+        }
+      } catch {
+        // 無効なペイロードは無視
+      }
+    };
+    return () => es.close();
+  }, [projectId]);
+
+  async function onSend(event: FormEvent<HTMLFormElement>) {
+    event.preventDefault();
+    if (!input.trim()) return;
+    setError(null);
+    setSending(true);
+    const fileIds = pickerRef.current?.getFileIds() ?? [];
+    const res = await fetch(`/api/projects/${projectId}/chat/messages`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ body: input, fileIds }),
+    });
+    if (res.ok) {
+      // 送信したメッセージを即座に表示(SSE到着前でも見えるように楽観追加)。
+      // SSEの chat.message.created は id で重複排除する。
+      const data = (await res.json().catch(() => null)) as {
+        message?: ChatMessageWithAttachments;
+      } | null;
+      if (data?.message) {
+        setMessages((prev) =>
+          prev.some((m) => m.id === data.message!.id)
+            ? prev
+            : [data.message!, ...prev]
+        );
+      }
+      setInput('');
+      pickerRef.current?.clear();
+    } else {
+      const b = (await res.json().catch(() => null)) as {
+        error?: { message?: string };
+      } | null;
+      setError(b?.error?.message ?? '送信に失敗しました');
+    }
+    setSending(false);
+  }
+
+  return (
+    <div className="flex h-[70vh] flex-col rounded-lg border bg-white dark:bg-gray-800 shadow-sm">
+      <div className="flex-1 overflow-y-auto p-4">
+        <ul className="space-y-2" data-testid="chat-messages">
+          {messages.map((m) => (
+            <li
+              key={m.id}
+              className={`flex flex-col ${m.authorId === 0 ? 'items-end' : 'items-start'}`}
+              data-message-id={m.id}
+            >
+              <span
+                className={`max-w-[80%] rounded-lg px-3 py-2 ${
+                  m.body.includes(`@${userName}`)
+                    ? 'bg-yellow-100 text-gray-800 dark:text-gray-100'
+                    : 'bg-gray-100 dark:bg-gray-700 text-gray-800 dark:text-gray-100'
+                }`}
+              >
+                {m.body}
+              </span>
+              {m.attachments && m.attachments.length > 0 && (
+                <div className="max-w-[80%]">
+                  <AttachmentList attachments={m.attachments} />
+                </div>
+              )}
+              <span className="mt-0.5 text-xs text-gray-400 dark:text-gray-500">
+                {m.createdAt}
+              </span>
+            </li>
+          ))}
+        </ul>
+      </div>
+      <form
+        onSubmit={onSend}
+        className="space-y-2 border-t p-3"
+        data-testid="chat-form"
+      >
+        <AttachmentPicker
+          ref={pickerRef}
+          projectId={projectId}
+          onLoadingChange={setPickerLoading}
+        />
+        <div className="flex gap-2">
+          <input
+            type="text"
+            value={input}
+            onChange={(e) => setInput(e.target.value)}
+            placeholder="メッセージを入力(@email でメンション)"
+            className="flex-1 rounded border px-3 py-2"
+            data-testid="chat-input"
+          />
+          <button
+            type="submit"
+            disabled={sending || pickerLoading}
+            className="rounded bg-blue-600 px-4 py-2 font-medium text-white hover:bg-blue-700 disabled:opacity-50"
+            data-testid="chat-send"
+          >
+            {sending ? '送信中...' : '送信'}
+          </button>
+        </div>
+      </form>
+      {error && (
+        <p className="px-3 pb-2 text-sm text-red-600" role="alert">
+          {error}
+        </p>
+      )}
+    </div>
+  );
+}

components/files/AttachmentList.tsx

@@ -0,0 +1,93 @@
+'use client';
+
+import { useEffect, useState } from 'react';
+import type { AttachmentView } from '@/lib/types';
+
+/**
+ * 添付ファイル一覧表示。画像はサムネイル(クリックでLightbox)、
+ * それ以外はダウンロードリンク。チャット/掲示板で共通利用。
+ */
+export function AttachmentList({
+  attachments,
+}: {
+  attachments: AttachmentView[];
+}) {
+  const [lightbox, setLightbox] = useState<AttachmentView | null>(null);
+
+  useEffect(() => {
+    if (!lightbox) return;
+    function onKey(e: KeyboardEvent) {
+      if (e.key === 'Escape') setLightbox(null);
+    }
+    window.addEventListener('keydown', onKey);
+    return () => window.removeEventListener('keydown', onKey);
+  }, [lightbox]);
+
+  if (attachments.length === 0) return null;
+
+  return (
+    <>
+      <ul className="mt-1 flex flex-wrap gap-2" data-testid="attachment-list">
+        {attachments.map((a) => {
+          const url = `/api/files/${a.fileId}/download`;
+          const isImage = a.mimeType.startsWith('image/');
+          return (
+            <li
+              key={a.id}
+              className="overflow-hidden rounded border bg-gray-50 dark:bg-gray-900"
+              data-testid={`attachment-${a.id}`}
+            >
+              {isImage ? (
+                <button
+                  type="button"
+                  onClick={() => setLightbox(a)}
+                  className="block"
+                  aria-label={`画像 ${a.originalName} を開く`}
+                >
+                  <img
+                    src={url}
+                    alt={a.originalName}
+                    className="h-20 w-20 object-cover"
+                  />
+                </button>
+              ) : (
+                <a
+                  href={url}
+                  className="flex h-20 w-28 flex-col items-center justify-center px-2 text-center text-xs text-blue-600 hover:underline"
+                >
+                  <span className="mb-1">📎</span>
+                  <span className="w-full truncate" title={a.originalName}>
+                    {a.originalName}
+                  </span>
+                </a>
+              )}
+            </li>
+          );
+        })}
+      </ul>
+
+      {lightbox && (
+        <div
+          className="fixed inset-0 z-50 flex items-center justify-center bg-black/80 p-4"
+          onClick={() => setLightbox(null)}
+          data-testid="attachment-lightbox"
+        >
+          <button
+            type="button"
+            onClick={() => setLightbox(null)}
+            className="absolute right-4 top-4 rounded bg-black/50 px-2 py-0.5 text-2xl text-white hover:bg-black/70"
+            aria-label="閉じる"
+          >
+            ×
+          </button>
+          <img
+            src={`/api/files/${lightbox.fileId}/download`}
+            alt={lightbox.originalName}
+            className="max-h-full max-w-full rounded"
+            onClick={(e) => e.stopPropagation()}
+          />
+        </div>
+      )}
+    </>
+  );
+}

components/files/AttachmentPicker.tsx

@@ -0,0 +1,166 @@
+'use client';
+
+import {
+  forwardRef,
+  useImperativeHandle,
+  useRef,
+  useState,
+  type ChangeEvent,
+} from 'react';
+
+export interface AttachmentPickerHandle {
+  getFileIds: () => number[];
+  clear: () => void;
+}
+
+interface PickedFile {
+  fileId: number;
+  originalName: string;
+  mimeType: string;
+}
+
+/**
+ * チャット/掲示板用の添付ファイルピッカー。
+ * 選択したファイルを添付用エンドポイントへアップロードし、
+ * 親フォームは送信時に getFileIds() でファイルIDを取り出す。
+ * 送信完了後は clear() で状態をリセットする。
+ */
+export const AttachmentPicker = forwardRef<
+  AttachmentPickerHandle,
+  { projectId: number; onLoadingChange?: (loading: boolean) => void }
+>(function AttachmentPicker({ projectId, onLoadingChange }, ref) {
+  const [files, setFiles] = useState<PickedFile[]>([]);
+  const [loading, setLoading] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+  const inputRef = useRef<HTMLInputElement>(null);
+
+  function reportLoading(next: boolean) {
+    setLoading(next);
+    onLoadingChange?.(next);
+  }
+
+  useImperativeHandle(
+    ref,
+    () => ({
+      getFileIds: () => files.map((f) => f.fileId),
+      clear: () => {
+        setFiles([]);
+        setError(null);
+        if (inputRef.current) inputRef.current.value = '';
+      },
+    }),
+    [files]
+  );
+
+  async function onFile(event: ChangeEvent<HTMLInputElement>) {
+    const selected = Array.from(event.target.files ?? []);
+    if (selected.length === 0) return;
+    reportLoading(true);
+    setError(null);
+    try {
+      const uploaded: PickedFile[] = [];
+      for (const f of selected) {
+        const form = new FormData();
+        form.append('file', f);
+        const res = await fetch(`/api/projects/${projectId}/attachments`, {
+          method: 'POST',
+          body: form,
+        });
+        if (!res.ok) {
+          const b = (await res.json().catch(() => null)) as {
+            error?: { message?: string };
+          } | null;
+          throw new Error(b?.error?.message ?? 'アップロードに失敗しました');
+        }
+        const data = (await res.json()) as {
+          file: { id: number; originalName: string; mimeType: string };
+        };
+        uploaded.push({
+          fileId: data.file.id,
+          originalName: data.file.originalName,
+          mimeType: data.file.mimeType,
+        });
+      }
+      setFiles((prev) => [...prev, ...uploaded]);
+    } catch (err) {
+      setError(
+        err instanceof Error ? err.message : 'アップロードに失敗しました'
+      );
+    } finally {
+      reportLoading(false);
+      if (inputRef.current) inputRef.current.value = '';
+    }
+  }
+
+  function removeFile(fileId: number) {
+    setFiles((prev) => prev.filter((f) => f.fileId !== fileId));
+  }
+
+  return (
+    <div className="space-y-2" data-testid="attachment-picker">
+      <label className="inline-flex cursor-pointer items-center gap-1 rounded border bg-white dark:bg-gray-800 px-3 py-1 text-sm text-gray-600 dark:text-gray-300 hover:bg-gray-100 dark:hover:bg-gray-700">
+        📎 添付
+        <input
+          ref={inputRef}
+          type="file"
+          multiple
+          onChange={onFile}
+          disabled={loading}
+          className="hidden"
+          data-testid="attachment-input"
+        />
+      </label>
+      {loading && (
+        <p
+          className="text-xs text-gray-500 dark:text-gray-400"
+          data-testid="attachment-loading"
+        >
+          アップロード中...
+        </p>
+      )}
+      {error && (
+        <p className="text-xs text-red-600" role="alert">
+          {error}
+        </p>
+      )}
+      {files.length > 0 && (
+        <ul className="flex flex-wrap gap-2">
+          {files.map((f) => {
+            const isImage = f.mimeType.startsWith('image/');
+            const url = `/api/files/${f.fileId}/download`;
+            return (
+              <li
+                key={f.fileId}
+                className="relative overflow-hidden rounded border bg-gray-50 dark:bg-gray-900"
+                data-testid={`attachment-picked-${f.fileId}`}
+              >
+                {isImage ? (
+                  <img
+                    src={url}
+                    alt={f.originalName}
+                    className="h-16 w-16 object-cover"
+                  />
+                ) : (
+                  <span className="flex h-16 w-24 items-center justify-center px-1 text-center text-[10px] text-blue-600">
+                    <span className="truncate" title={f.originalName}>
+                      {f.originalName}
+                    </span>
+                  </span>
+                )}
+                <button
+                  type="button"
+                  onClick={() => removeFile(f.fileId)}
+                  className="absolute right-0 top-0 rounded-bl bg-black/50 px-1 text-xs text-white hover:bg-black/70"
+                  aria-label={`${f.originalName} を削除`}
+                  data-testid={`attachment-remove-${f.fileId}`}
+                >
+                  ×
+                </button>
+              </li>
+            );
+          })}
+        </ul>
+      )}
+    </div>
+  );
+});

components/files/FileList.tsx

@@ -0,0 +1,113 @@
+'use client';
+
+import { useState } from 'react';
+import { useRouter } from 'next/navigation';
+import type { FileAsset } from '@/lib/types';
+
+export function FileList({
+  files,
+  canDelete,
+}: {
+  files: FileAsset[];
+  canDelete: boolean;
+}) {
+  const router = useRouter();
+  const [lightbox, setLightbox] = useState<FileAsset | null>(null);
+
+  async function onDelete(fileId: number) {
+    const res = await fetch(`/api/files/${fileId}`, { method: 'DELETE' });
+    if (res.ok) router.refresh();
+  }
+
+  if (files.length === 0) {
+    return (
+      <p className="text-sm text-gray-400 dark:text-gray-500">
+        ファイルはありません。
+      </p>
+    );
+  }
+
+  return (
+    <>
+      <ul
+        className="grid grid-cols-2 gap-3 sm:grid-cols-3"
+        data-testid="file-list"
+      >
+        {files.map((file) => {
+          const isImage = file.mimeType.startsWith('image/');
+          const isPdf = file.mimeType === 'application/pdf';
+          const url = `/api/files/${file.id}/download`;
+          return (
+            <li
+              key={file.id}
+              className="rounded-lg border bg-white dark:bg-gray-800 p-3 shadow-sm"
+              data-testid={`file-item-${file.id}`}
+            >
+              {isImage ? (
+                <button
+                  type="button"
+                  onClick={() => setLightbox(file)}
+                  className="block w-full"
+                >
+                  <img
+                    src={url}
+                    alt={file.originalName}
+                    className="h-24 w-full rounded object-cover"
+                  />
+                </button>
+              ) : isPdf ? (
+                <a
+                  href={url}
+                  target="_blank"
+                  rel="noreferrer"
+                  className="flex h-24 items-center justify-center rounded bg-gray-100 dark:bg-gray-700 text-sm text-blue-600 hover:underline"
+                >
+                  PDF を開く
+                </a>
+              ) : (
+                <a
+                  href={url}
+                  className="flex h-24 items-center justify-center rounded bg-gray-100 dark:bg-gray-700 text-sm text-blue-600 hover:underline"
+                >
+                  ダウンロード
+                </a>
+              )}
+              <p
+                className="mt-2 truncate text-xs text-gray-700 dark:text-gray-200"
+                title={file.originalName}
+              >
+                {file.originalName}
+              </p>
+              <p className="text-xs text-gray-400 dark:text-gray-500">
+                {file.size} bytes
+              </p>
+              {canDelete && (
+                <button
+                  type="button"
+                  onClick={() => onDelete(file.id)}
+                  className="mt-1 text-xs text-red-600 hover:underline"
+                >
+                  削除
+                </button>
+              )}
+            </li>
+          );
+        })}
+      </ul>
+
+      {lightbox && (
+        <div
+          className="fixed inset-0 z-50 flex items-center justify-center bg-black/80 p-4"
+          onClick={() => setLightbox(null)}
+          data-testid="lightbox"
+        >
+          <img
+            src={`/api/files/${lightbox.id}/download`}
+            alt={lightbox.originalName}
+            className="max-h-full max-w-full rounded"
+          />
+        </div>
+      )}
+    </>
+  );
+}

components/files/Uploader.tsx

@@ -0,0 +1,60 @@
+'use client';
+
+import { useRef, useState } from 'react';
+import { useRouter } from 'next/navigation';
+
+export function Uploader({ projectId }: { projectId: number }) {
+  const router = useRouter();
+  const inputRef = useRef<HTMLInputElement>(null);
+  const [loading, setLoading] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+
+  async function onFile(event: React.ChangeEvent<HTMLInputElement>) {
+    const file = event.target.files?.[0];
+    if (!file) return;
+    setLoading(true);
+    setError(null);
+    const form = new FormData();
+    form.append('file', file);
+    const res = await fetch(`/api/projects/${projectId}/files`, {
+      method: 'POST',
+      body: form,
+    });
+    setLoading(false);
+    if (res.ok) {
+      if (inputRef.current) inputRef.current.value = '';
+      router.refresh();
+    } else {
+      const b = (await res.json().catch(() => null)) as {
+        error?: { message?: string };
+      } | null;
+      setError(b?.error?.message ?? 'アップロードに失敗しました');
+    }
+  }
+
+  return (
+    <div className="rounded-lg border bg-white dark:bg-gray-800 p-4 shadow-sm">
+      <label className="block text-sm font-medium">
+        ファイルをアップロード
+      </label>
+      <input
+        ref={inputRef}
+        type="file"
+        onChange={onFile}
+        disabled={loading}
+        className="mt-2 block text-sm"
+        data-testid="file-input"
+      />
+      {loading && (
+        <p className="mt-1 text-sm text-gray-500 dark:text-gray-400">
+          アップロード中...
+        </p>
+      )}
+      {error && (
+        <p className="mt-1 text-sm text-red-600" role="alert">
+          {error}
+        </p>
+      )}
+    </div>
+  );
+}

components/layout/Header.tsx

@@ -0,0 +1,52 @@
+'use client';
+
+import { useRouter } from 'next/navigation';
+import type { PublicUser } from '@/lib/auth/getCurrentUser';
+import { NotificationBadge } from '@/components/notifications/NotificationBadge';
+import { ThemeToggle } from '@/components/layout/ThemeToggle';
+import { useI18n } from '@/lib/i18n/I18nProvider';
+
+export function Header({ user }: { user: PublicUser }) {
+  const router = useRouter();
+  const { t } = useI18n();
+
+  async function handleLogout() {
+    await fetch('/api/auth/logout', { method: 'POST' });
+    router.push('/login');
+    router.refresh();
+  }
+
+  return (
+    <header className="flex items-center justify-between border-b bg-white px-6 py-3 dark:border-gray-700 dark:bg-gray-800">
+      <a
+        href="/dashboard"
+        className="font-bold text-gray-800 dark:text-gray-100"
+      >
+        {t('app.name')}
+      </a>
+      <nav className="flex items-center gap-3 text-sm sm:gap-4">
+        <a
+          href="/dashboard"
+          className="hidden text-gray-600 hover:underline sm:inline dark:text-gray-300"
+        >
+          {t('nav.dashboard')}
+        </a>
+        <ThemeToggle />
+        <NotificationBadge />
+        <a
+          href="/profile"
+          className="text-gray-600 hover:underline dark:text-gray-300"
+        >
+          {user.name}
+        </a>
+        <button
+          type="button"
+          onClick={handleLogout}
+          className="text-blue-600 hover:underline dark:text-blue-400"
+        >
+          {t('header.logout')}
+        </button>
+      </nav>
+    </header>
+  );
+}

components/layout/ProjectNav.tsx

@@ -0,0 +1,71 @@
+'use client';
+
+import { useI18n } from '@/lib/i18n/I18nProvider';
+import type { MessageKey } from '@/lib/i18n/dictionary';
+
+const NAV_ITEMS: { href: string; key: MessageKey; activeKey: string }[] = [
+  { href: '', key: 'nav.overview', activeKey: 'overview' },
+  { href: '/board', key: 'nav.board', activeKey: 'board' },
+  { href: '/notes', key: 'nav.notes', activeKey: 'notes' },
+  { href: '/chat', key: 'nav.chat', activeKey: 'chat' },
+  { href: '/todos', key: 'nav.todos', activeKey: 'todos' },
+  { href: '/files', key: 'nav.files', activeKey: 'files' },
+  { href: '/calendar', key: 'nav.calendar', activeKey: 'calendar' },
+  { href: '/milestones', key: 'nav.milestones', activeKey: 'milestones' },
+  { href: '/meetings', key: 'nav.meetings', activeKey: 'meetings' },
+  { href: '/search', key: 'nav.search', activeKey: 'search' },
+  { href: '/members', key: 'nav.members', activeKey: 'members' },
+  { href: '/activity', key: 'nav.activity', activeKey: 'activity' },
+  { href: '/settings', key: 'nav.settings', activeKey: 'settings' },
+];
+
+/**
+ * プロジェクト内サブナビゲーション。
+ * href は `/projects/{projectId}` を起点とする相対パス。
+ */
+export function ProjectNav({
+  projectId,
+  active,
+}: {
+  projectId: number;
+  active:
+    | 'overview'
+    | 'board'
+    | 'notes'
+    | 'chat'
+    | 'todos'
+    | 'files'
+    | 'calendar'
+    | 'milestones'
+    | 'meetings'
+    | 'search'
+    | 'members'
+    | 'activity'
+    | 'settings';
+}) {
+  const { t } = useI18n();
+
+  return (
+    <nav
+      data-testid="project-nav"
+      className="flex gap-4 overflow-x-auto whitespace-nowrap border-b bg-white px-6 py-2 text-sm dark:border-gray-700 dark:bg-gray-800"
+    >
+      {NAV_ITEMS.map((item) => {
+        const href = `/projects/${projectId}${item.href}`;
+        return (
+          <a
+            key={item.href}
+            href={href}
+            className={
+              active === item.activeKey
+                ? 'font-medium text-blue-600 dark:text-blue-400'
+                : 'text-gray-600 hover:underline dark:text-gray-300'
+            }
+          >
+            {t(item.key)}
+          </a>
+        );
+      })}
+    </nav>
+  );
+}

components/layout/Sidebar.tsx

@@ -0,0 +1,11 @@
+/**
+ * プロジェクトページ共通のサイドバー。
+ * プロジェクト内ナビゲーションは ProjectNav に委譲する。
+ */
+export function Sidebar({ children }: { children: React.ReactNode }) {
+  return (
+    <aside className="w-48 shrink-0 border-r bg-gray-50 dark:bg-gray-900 p-4">
+      {children}
+    </aside>
+  );
+}

components/layout/ThemeToggle.tsx

@@ -0,0 +1,24 @@
+'use client';
+
+import { useI18n } from '@/lib/i18n/I18nProvider';
+
+/**
+ * ヘッダー等に置くテーマ切替ボタン。
+ * クリックで dark/light を即時切替(Cookie + ユーザー設定へ永続化)。
+ */
+export function ThemeToggle() {
+  const { theme, setTheme } = useI18n();
+  const next = theme === 'dark' ? 'light' : 'dark';
+
+  return (
+    <button
+      type="button"
+      onClick={() => void setTheme(next)}
+      aria-label={theme === 'dark' ? 'Switch to light' : 'Switch to dark'}
+      data-testid="theme-toggle"
+      className="rounded px-2 py-1 text-sm text-gray-600 hover:underline dark:text-gray-300"
+    >
+      {theme === 'dark' ? '☀️' : '🌙'}
+    </button>
+  );
+}

components/meetings/ConflictWarning.tsx

@@ -0,0 +1,46 @@
+export interface ScheduleConflict {
+  userId: number;
+  type: 'meeting' | 'calendar_event' | 'important_todo';
+  refId: number;
+  title: string;
+  startAt: string;
+  endAt: string | null;
+}
+
+const TYPE_LABELS: Record<string, string> = {
+  meeting: 'ミーティング',
+  calendar_event: 'カレンダーイベント',
+  important_todo: '期限の近い重要タスク',
+};
+
+export function ConflictWarning({
+  conflicts,
+}: {
+  conflicts: ScheduleConflict[];
+}) {
+  if (conflicts.length === 0) {
+    return (
+      <p className="text-sm text-green-600" data-testid="no-conflicts">
+        スケジュールの重複はありません。
+      </p>
+    );
+  }
+  return (
+    <div
+      className="rounded border border-yellow-300 bg-yellow-50 p-3"
+      data-testid="conflict-warning"
+    >
+      <p className="text-sm font-semibold text-yellow-800">
+        スケジュールの重複があります（作成は完了しています）:
+      </p>
+      <ul className="mt-1 list-inside list-disc text-sm text-yellow-800">
+        {conflicts.map((c, i) => (
+          <li key={i}>
+            [{TYPE_LABELS[c.type] ?? c.type}] {c.title}（{c.startAt}
+            {c.endAt ? ` 〜 ${c.endAt}` : ''}）
+          </li>
+        ))}
+      </ul>
+    </div>
+  );
+}

components/meetings/MeetingForm.tsx

@@ -0,0 +1,143 @@
+'use client';
+
+import { useState, type FormEvent } from 'react';
+import { useRouter } from 'next/navigation';
+import {
+  ConflictWarning,
+  type ScheduleConflict,
+} from '@/components/meetings/ConflictWarning';
+
+interface Member {
+  userId: number;
+  name: string;
+}
+
+export function MeetingForm({
+  projectId,
+  members,
+}: {
+  projectId: number;
+  members: Member[];
+}) {
+  const router = useRouter();
+  const [title, setTitle] = useState('');
+  const [startAt, setStartAt] = useState('');
+  const [endAt, setEndAt] = useState('');
+  const [selected, setSelected] = useState<number[]>([]);
+  const [conflicts, setConflicts] = useState<ScheduleConflict[] | null>(null);
+  const [loading, setLoading] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+
+  async function onSubmit(event: FormEvent<HTMLFormElement>) {
+    event.preventDefault();
+    setLoading(true);
+    setError(null);
+    setConflicts(null);
+    const res = await fetch(`/api/projects/${projectId}/meetings`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ title, startAt, endAt, memberIds: selected }),
+    });
+    setLoading(false);
+    if (res.ok) {
+      const data = (await res.json()) as {
+        meeting: { id: number };
+        conflicts: ScheduleConflict[];
+      };
+      setConflicts(data.conflicts);
+      setTitle('');
+      setStartAt('');
+      setEndAt('');
+      setSelected([]);
+      router.refresh();
+    } else {
+      const b = (await res.json().catch(() => null)) as {
+        error?: { message?: string };
+      } | null;
+      setError(b?.error?.message ?? '作成に失敗しました');
+    }
+  }
+
+  function toggleMember(userId: number) {
+    setSelected((prev) =>
+      prev.includes(userId)
+        ? prev.filter((u) => u !== userId)
+        : [...prev, userId]
+    );
+  }
+
+  return (
+    <form
+      onSubmit={onSubmit}
+      className="space-y-3 rounded-lg border bg-white dark:bg-gray-800 p-4 shadow-sm"
+      data-testid="meeting-form"
+    >
+      <div>
+        <label className="block text-sm font-medium">タイトル</label>
+        <input
+          type="text"
+          value={title}
+          onChange={(e) => setTitle(e.target.value)}
+          className="mt-1 w-full rounded border px-3 py-2"
+          required
+          data-testid="meeting-title"
+        />
+      </div>
+      <div className="flex gap-2">
+        <div className="flex-1">
+          <label className="block text-sm font-medium">開始</label>
+          <input
+            type="datetime-local"
+            value={startAt}
+            onChange={(e) => setStartAt(e.target.value)}
+            className="mt-1 w-full rounded border px-3 py-2"
+            required
+            data-testid="meeting-start"
+          />
+        </div>
+        <div className="flex-1">
+          <label className="block text-sm font-medium">終了</label>
+          <input
+            type="datetime-local"
+            value={endAt}
+            onChange={(e) => setEndAt(e.target.value)}
+            className="mt-1 w-full rounded border px-3 py-2"
+            required
+            data-testid="meeting-end"
+          />
+        </div>
+      </div>
+      <div>
+        <label className="block text-sm font-medium">参加メンバー</label>
+        <div className="mt-1 flex flex-wrap gap-2">
+          {members.map((m) => (
+            <label
+              key={m.userId}
+              className="flex items-center gap-1 rounded border px-2 py-1 text-sm"
+            >
+              <input
+                type="checkbox"
+                checked={selected.includes(m.userId)}
+                onChange={() => toggleMember(m.userId)}
+              />
+              {m.name}
+            </label>
+          ))}
+        </div>
+      </div>
+      {error && (
+        <p className="text-sm text-red-600" role="alert">
+          {error}
+        </p>
+      )}
+      <button
+        type="submit"
+        disabled={loading}
+        className="rounded bg-blue-600 px-4 py-2 font-medium text-white hover:bg-blue-700 disabled:opacity-50"
+      >
+        {loading ? '作成中...' : 'ミーティング作成'}
+      </button>
+      {conflicts && <ConflictWarning conflicts={conflicts} />}
+    </form>
+  );
+}

components/notes/NoteEditor.tsx

@@ -0,0 +1,104 @@
+'use client';
+
+import { useState, type FormEvent } from 'react';
+import { useRouter } from 'next/navigation';
+import type { ProjectNote } from '@/lib/types';
+
+export function NoteEditor({
+  projectId,
+  note,
+}: {
+  projectId: number;
+  note: ProjectNote;
+}) {
+  const router = useRouter();
+  const [title, setTitle] = useState(note.title);
+  const [bodyMd, setBodyMd] = useState(note.bodyMd);
+  const [tags, setTags] = useState(note.tags ?? '');
+  const [isPinned, setIsPinned] = useState(note.isPinned === 1);
+  const [error, setError] = useState<string | null>(null);
+  const [saved, setSaved] = useState(false);
+  const [loading, setLoading] = useState(false);
+
+  async function onSubmit(event: FormEvent<HTMLFormElement>) {
+    event.preventDefault();
+    setLoading(true);
+    setError(null);
+    setSaved(false);
+    const res = await fetch(`/api/projects/${projectId}/notes/${note.id}`, {
+      method: 'PATCH',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({
+        title,
+        bodyMd,
+        tags: tags || null,
+        isPinned: isPinned ? 1 : 0,
+      }),
+    });
+    setLoading(false);
+    if (res.ok) {
+      setSaved(true);
+      router.refresh();
+    } else {
+      const b = (await res.json().catch(() => null)) as {
+        error?: { message?: string };
+      } | null;
+      setError(b?.error?.message ?? '更新に失敗しました');
+    }
+  }
+
+  return (
+    <form
+      onSubmit={onSubmit}
+      className="space-y-3 rounded-lg border bg-white dark:bg-gray-800 p-4 shadow-sm"
+    >
+      <h2 className="text-sm font-semibold text-gray-700 dark:text-gray-200">
+        編集
+      </h2>
+      <input
+        type="text"
+        value={title}
+        onChange={(e) => setTitle(e.target.value)}
+        className="w-full rounded border px-3 py-2"
+        required
+        maxLength={200}
+      />
+      <textarea
+        value={bodyMd}
+        onChange={(e) => setBodyMd(e.target.value)}
+        className="min-h-[160px] w-full rounded border px-3 py-2"
+        required
+      />
+      <div className="flex gap-2">
+        <input
+          type="text"
+          placeholder="タグ（カンマ区切り）"
+          value={tags}
+          onChange={(e) => setTags(e.target.value)}
+          className="flex-1 rounded border px-3 py-2"
+        />
+        <label className="flex items-center gap-1 text-sm">
+          <input
+            type="checkbox"
+            checked={isPinned}
+            onChange={(e) => setIsPinned(e.target.checked)}
+          />
+          ピン留め
+        </label>
+      </div>
+      {error && (
+        <p className="text-sm text-red-600" role="alert">
+          {error}
+        </p>
+      )}
+      {saved && <p className="text-sm text-green-600">メモを更新しました</p>}
+      <button
+        type="submit"
+        disabled={loading}
+        className="rounded bg-blue-600 px-4 py-2 font-medium text-white hover:bg-blue-700 disabled:opacity-50"
+      >
+        {loading ? '保存中...' : '保存'}
+      </button>
+    </form>
+  );
+}

components/notes/NoteForm.tsx

@@ -0,0 +1,78 @@
+'use client';
+
+import { useState, type FormEvent } from 'react';
+import { useRouter } from 'next/navigation';
+
+export function NoteForm({ projectId }: { projectId: number }) {
+  const router = useRouter();
+  const [title, setTitle] = useState('');
+  const [bodyMd, setBodyMd] = useState('');
+  const [tags, setTags] = useState('');
+  const [error, setError] = useState<string | null>(null);
+  const [loading, setLoading] = useState(false);
+
+  async function onSubmit(event: FormEvent<HTMLFormElement>) {
+    event.preventDefault();
+    setLoading(true);
+    setError(null);
+    const res = await fetch(`/api/projects/${projectId}/notes`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ title, bodyMd, tags: tags || undefined }),
+    });
+    setLoading(false);
+    if (res.ok) {
+      const data = (await res.json()) as { note: { id: number } };
+      router.push(`/projects/${projectId}/notes/${data.note.id}`);
+      router.refresh();
+    } else {
+      const b = (await res.json().catch(() => null)) as {
+        error?: { message?: string };
+      } | null;
+      setError(b?.error?.message ?? '作成に失敗しました');
+    }
+  }
+
+  return (
+    <form
+      onSubmit={onSubmit}
+      className="space-y-3 rounded-lg border bg-white dark:bg-gray-800 p-4 shadow-sm"
+    >
+      <input
+        type="text"
+        placeholder="タイトル"
+        value={title}
+        onChange={(e) => setTitle(e.target.value)}
+        className="w-full rounded border px-3 py-2"
+        required
+        maxLength={200}
+      />
+      <textarea
+        placeholder="本文（Markdown）"
+        value={bodyMd}
+        onChange={(e) => setBodyMd(e.target.value)}
+        className="min-h-[120px] w-full rounded border px-3 py-2"
+        required
+      />
+      <input
+        type="text"
+        placeholder="タグ（カンマ区切り）"
+        value={tags}
+        onChange={(e) => setTags(e.target.value)}
+        className="w-full rounded border px-3 py-2"
+      />
+      {error && (
+        <p className="text-sm text-red-600" role="alert">
+          {error}
+        </p>
+      )}
+      <button
+        type="submit"
+        disabled={loading}
+        className="rounded bg-blue-600 px-4 py-2 font-medium text-white hover:bg-blue-700 disabled:opacity-50"
+      >
+        {loading ? '作成中...' : 'メモ作成'}
+      </button>
+    </form>
+  );
+}

components/notifications/MarkReadButton.tsx

@@ -0,0 +1,31 @@
+'use client';
+
+import { useState } from 'react';
+import { useRouter } from 'next/navigation';
+
+export function MarkReadButton({ notificationId }: { notificationId: number }) {
+  const router = useRouter();
+  const [busy, setBusy] = useState(false);
+
+  async function onRead() {
+    setBusy(true);
+    const res = await fetch(`/api/notifications/${notificationId}/read`, {
+      method: 'POST',
+    });
+    setBusy(false);
+    if (res.ok) {
+      router.refresh();
+    }
+  }
+
+  return (
+    <button
+      type="button"
+      onClick={onRead}
+      disabled={busy}
+      className="text-xs text-gray-500 dark:text-gray-400 hover:underline disabled:opacity-50"
+    >
+      {busy ? '処理中...' : '既読にする'}
+    </button>
+  );
+}

components/notifications/NotificationBadge.tsx

@@ -0,0 +1,46 @@
+'use client';
+
+import { useEffect, useState } from 'react';
+
+export function NotificationBadge() {
+  const [count, setCount] = useState(0);
+
+  useEffect(() => {
+    let active = true;
+    fetch('/api/notifications?page=1')
+      .then((res) => (res.ok ? res.json() : null))
+      .then((data) => {
+        if (active && data && typeof data.total === 'number') {
+          setCount(data.total);
+        }
+      })
+      .catch(() => undefined);
+    return () => {
+      active = false;
+    };
+  }, []);
+
+  if (count === 0) {
+    return (
+      <a
+        href="/notifications"
+        className="text-gray-600 dark:text-gray-300 hover:underline"
+      >
+        通知
+      </a>
+    );
+  }
+
+  return (
+    <a
+      href="/notifications"
+      className="relative text-gray-600 dark:text-gray-300 hover:underline"
+      data-notification-count={count}
+    >
+      通知
+      <span className="ml-1 rounded-full bg-red-500 px-1.5 py-0.5 text-xs text-white">
+        {count > 99 ? '99+' : count}
+      </span>
+    </a>
+  );
+}

components/notifications/NotificationList.tsx

@@ -0,0 +1,58 @@
+import type { Notification } from '@/lib/types';
+import { MarkReadButton } from '@/components/notifications/MarkReadButton';
+
+const TYPE_LABELS: Record<string, string> = {
+  mention: 'メンション',
+  todo_assigned: 'ToDo担当',
+  todo_due_soon: 'ToDo期限',
+  meeting_invited: 'ミーティング招待',
+  board_commented: '掲示板コメント',
+  project_added: 'プロジェクト追加',
+  file_shared: 'ファイル共有',
+  note_updated: 'メモ更新',
+};
+
+export function NotificationList({
+  notifications,
+}: {
+  notifications: Notification[];
+}) {
+  if (notifications.length === 0) {
+    return (
+      <p className="text-sm text-gray-400 dark:text-gray-500">
+        未読の通知はありません。
+      </p>
+    );
+  }
+
+  return (
+    <ul className="divide-y rounded-lg border bg-white dark:bg-gray-800 shadow-sm">
+      {notifications.map((notification) => (
+        <li key={notification.id} className="p-4">
+          <div className="flex items-center justify-between">
+            <span className="rounded bg-blue-100 px-2 py-0.5 text-xs text-blue-700">
+              {TYPE_LABELS[notification.type] ?? notification.type}
+            </span>
+            <MarkReadButton notificationId={notification.id} />
+          </div>
+          <p className="mt-2 font-medium text-gray-800 dark:text-gray-100">
+            {notification.title}
+          </p>
+          {notification.body && (
+            <p className="mt-1 text-sm text-gray-600 dark:text-gray-300">
+              {notification.body}
+            </p>
+          )}
+          {notification.projectId !== null && (
+            <a
+              href={`/projects/${notification.projectId}`}
+              className="mt-1 inline-block text-xs text-blue-600 hover:underline"
+            >
+              プロジェクトを開く
+            </a>
+          )}
+        </li>
+      ))}
+    </ul>
+  );
+}

components/project/AddMemberForm.tsx

@@ -0,0 +1,84 @@
+'use client';
+
+import { useState, type FormEvent } from 'react';
+import { useRouter } from 'next/navigation';
+
+export function AddMemberForm({ projectId }: { projectId: number }) {
+  const router = useRouter();
+  const [email, setEmail] = useState('');
+  const [role, setRole] = useState('member');
+  const [error, setError] = useState<string | null>(null);
+  const [loading, setLoading] = useState(false);
+
+  async function onSubmit(event: FormEvent<HTMLFormElement>) {
+    event.preventDefault();
+    setLoading(true);
+    setError(null);
+
+    const res = await fetch(`/api/projects/${projectId}/members`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ email, role }),
+    });
+
+    if (res.ok) {
+      setEmail('');
+      router.refresh();
+      return;
+    }
+
+    const body = (await res.json().catch(() => null)) as {
+      error?: { message?: string };
+    } | null;
+    setError(body?.error?.message ?? 'メンバー追加に失敗しました');
+    setLoading(false);
+  }
+
+  return (
+    <form
+      onSubmit={onSubmit}
+      className="flex flex-col gap-2 rounded border bg-white dark:bg-gray-800 p-4 sm:flex-row sm:items-end"
+    >
+      <div className="flex-1">
+        <label htmlFor="member-email" className="block text-sm font-medium">
+          追加するユーザーのメールアドレス
+        </label>
+        <input
+          id="member-email"
+          type="email"
+          value={email}
+          onChange={(e) => setEmail(e.target.value)}
+          className="mt-1 w-full rounded border px-3 py-2"
+          required
+        />
+      </div>
+      <div>
+        <label htmlFor="member-role" className="block text-sm font-medium">
+          ロール
+        </label>
+        <select
+          id="member-role"
+          value={role}
+          onChange={(e) => setRole(e.target.value)}
+          className="mt-1 rounded border px-3 py-2"
+        >
+          <option value="member">member</option>
+          <option value="admin">admin</option>
+          <option value="guest">guest</option>
+        </select>
+      </div>
+      <button
+        type="submit"
+        disabled={loading}
+        className="rounded bg-blue-600 px-4 py-2 font-medium text-white hover:bg-blue-700 disabled:opacity-50"
+      >
+        {loading ? '追加中...' : 'メンバー追加'}
+      </button>
+      {error && (
+        <p className="text-sm text-red-600" role="alert">
+          {error}
+        </p>
+      )}
+    </form>
+  );
+}

components/project/CreateProjectForm.tsx

@@ -0,0 +1,87 @@
+'use client';
+
+import { useState, type FormEvent } from 'react';
+import { useRouter } from 'next/navigation';
+import { useI18n } from '@/lib/i18n/I18nProvider';
+
+export function CreateProjectForm() {
+  const router = useRouter();
+  const { t } = useI18n();
+  const [name, setName] = useState('');
+  const [description, setDescription] = useState('');
+  const [error, setError] = useState<string | null>(null);
+  const [loading, setLoading] = useState(false);
+
+  async function onSubmit(event: FormEvent<HTMLFormElement>) {
+    event.preventDefault();
+    setLoading(true);
+    setError(null);
+
+    const res = await fetch('/api/projects', {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ name, description: description || undefined }),
+    });
+
+    if (res.ok) {
+      const data = (await res.json()) as { project: { id: number } };
+      router.push(`/projects/${data.project.id}`);
+      return;
+    }
+
+    const body = (await res.json().catch(() => null)) as {
+      error?: { message?: string };
+    } | null;
+    setError(body?.error?.message ?? t('project.createFailed'));
+    setLoading(false);
+  }
+
+  return (
+    <form
+      onSubmit={onSubmit}
+      className="flex flex-col gap-2 rounded-lg border bg-white p-4 shadow-sm sm:flex-row sm:items-end dark:border-gray-700 dark:bg-gray-800"
+    >
+      <div className="flex-1">
+        <label htmlFor="project-name" className="block text-sm font-medium">
+          {t('auth.projectName')}
+        </label>
+        <input
+          id="project-name"
+          type="text"
+          value={name}
+          onChange={(e) => setName(e.target.value)}
+          className="mt-1 w-full rounded border px-3 py-2 dark:border-gray-600 dark:bg-gray-700"
+          required
+          maxLength={200}
+        />
+      </div>
+      <div className="flex-1">
+        <label
+          htmlFor="project-description"
+          className="block text-sm font-medium"
+        >
+          {t('project.description')}
+        </label>
+        <input
+          id="project-description"
+          type="text"
+          value={description}
+          onChange={(e) => setDescription(e.target.value)}
+          className="mt-1 w-full rounded border px-3 py-2 dark:border-gray-600 dark:bg-gray-700"
+        />
+      </div>
+      <button
+        type="submit"
+        disabled={loading}
+        className="rounded bg-blue-600 px-4 py-2 font-medium text-white hover:bg-blue-700 disabled:opacity-50"
+      >
+        {loading ? t('project.creating') : t('auth.newProject')}
+      </button>
+      {error && (
+        <p className="text-sm text-red-600 sm:full" role="alert">
+          {error}
+        </p>
+      )}
+    </form>
+  );
+}