feat(m12): meetings + schedule conflict detection, tests, e2e

- MeetingRepository (CRUD, soft-delete, members, findMeetingsByUserInRange
  overlap) + CalendarRepository.findByCreatorInRange + TodoRepository.
  findHighPriorityByAssignee
- MeetingService (createMeeting tx+members, meeting_invited notify,
  meeting_created activity, SSE meeting.created; updateMeeting/updateMinutes/
  deleteMeeting; checkScheduleConflicts = other meetings overlap + calendar
  events overlap + high-priority todos due +-3d, time-overlap logic,
  excludeMeetingId; conflicts are warnings)
- APIs: meetings list/create/edit + /check conflict check
- Screens: meetings page + MeetingForm(member checkboxes, conflict display)
  + ConflictWarning, ProjectNav link
- Unit tests (MeetingRepository, MeetingService incl. conflict algorithm)
  + e2e meetings

tests/unit/repositories/MeetingRepository.test.ts

@@ -0,0 +1,98 @@
+import { describe, it, expect, beforeEach, afterEach } from 'vitest';
+import { createMigratedTestDb } from '@/tests/helpers/db';
+import type { SqliteDatabase } from '@/lib/db/sqlite';
+import { UserRepository } from '@/repositories/UserRepository';
+import { ProjectRepository } from '@/repositories/ProjectRepository';
+import { ProjectMemberRepository } from '@/repositories/ProjectMemberRepository';
+import { MeetingRepository } from '@/repositories/MeetingRepository';
+
+describe('MeetingRepository', () => {
+  let db: SqliteDatabase;
+  let repo: MeetingRepository;
+  let projectId: number;
+  let userId: number;
+
+  beforeEach(() => {
+    db = createMigratedTestDb();
+    repo = new MeetingRepository(db);
+    userId = new UserRepository(db).create({
+      name: 'U',
+      email: 'u@example.com',
+      passwordHash: 'h',
+    }).id;
+    projectId = new ProjectRepository(db).create({
+      name: 'P',
+      ownerId: userId,
+    }).id;
+    new ProjectMemberRepository(db).add(projectId, userId, 'admin');
+  });
+
+  afterEach(() => db.close());
+
+  function createMeeting(title: string, startAt: string, endAt: string) {
+    return repo.create({
+      projectId,
+      title,
+      startAt,
+      endAt,
+      createdById: userId,
+    });
+  }
+
+  it('creates and finds a meeting', () => {
+    const m = createMeeting('M', '2026-06-15T10:00:00', '2026-06-15T11:00:00');
+    expect(repo.findById(m.id)?.title).toBe('M');
+    expect(repo.findByProject(projectId)).toHaveLength(1);
+  });
+
+  it('excludes soft-deleted meetings', () => {
+    const m = createMeeting('M', '2026-06-15T10:00:00', '2026-06-15T11:00:00');
+    repo.delete(m.id);
+    expect(repo.findById(m.id)).toBeNull();
+    expect(repo.findByProject(projectId)).toHaveLength(0);
+  });
+
+  it('updates a meeting', () => {
+    const m = createMeeting('M', '2026-06-15T10:00:00', '2026-06-15T11:00:00');
+    expect(repo.update(m.id, { title: 'M2', minutesMd: 'mins' })?.title).toBe(
+      'M2'
+    );
+    expect(repo.findById(m.id)?.minutesMd).toBe('mins');
+  });
+
+  it('adds and lists members', () => {
+    const m = createMeeting('M', '2026-06-15T10:00:00', '2026-06-15T11:00:00');
+    repo.addMember(m.id, userId);
+    expect(repo.findMembersByMeeting(m.id)).toHaveLength(1);
+    expect(repo.findMembersByMeeting(m.id)[0].status).toBe('invited');
+  });
+
+  it('removes a member', () => {
+    const m = createMeeting('M', '2026-06-15T10:00:00', '2026-06-15T11:00:00');
+    repo.addMember(m.id, userId);
+    repo.removeMember(m.id, userId);
+    expect(repo.findMembersByMeeting(m.id)).toHaveLength(0);
+  });
+
+  it('findMeetingsByUserInRange returns overlapping meetings and respects excludeMeetingId', () => {
+    const m1 = createMeeting(
+      'overlapping',
+      '2026-06-15T10:00:00',
+      '2026-06-15T11:00:00'
+    );
+    repo.addMember(m1.id, userId);
+    const found = repo.findMeetingsByUserInRange(
+      userId,
+      '2026-06-15T10:30:00',
+      '2026-06-15T11:30:00'
+    );
+    expect(found.map((m) => m.id)).toContain(m1.id);
+    const excluded = repo.findMeetingsByUserInRange(
+      userId,
+      '2026-06-15T10:30:00',
+      '2026-06-15T11:30:00',
+      m1.id
+    );
+    expect(excluded.map((m) => m.id)).not.toContain(m1.id);
+  });
+});