feat(m13): cross-resource search + dashboard completion, tests, e2e

- SearchService (cross-resource keyword search across board/chat/todo/file/
  event/meeting/milestone/note with type filter, project isolation)
- DashboardService (project dashboard: in-progress todos, near-due(7d),
  latest chat/board/notes/files(5), next meeting, milestones w/ progress,
  recent activity(10); personal dashboard: my projects, incomplete todos,
  upcoming meetings, unread notifications, overdue tasks, recent activity)
- CalendarRepository.findByProject
- APIs: GET /api/projects/:projectId/search, GET /api/dashboard
- Screens: complete personal dashboard, complete project overview,
  search page + SearchForm, ProjectNav 検索 link
- Unit tests (SearchService, DashboardService) + e2e dashboard

tests/e2e/dashboard.spec.ts

@@ -0,0 +1,85 @@
+import { test, expect } from '@playwright/test';
+
+function unique(prefix: string): string {
+  return `${prefix}-${Date.now()}-${Math.floor(Math.random() * 1_000_000)}`;
+}
+
+async function setupOwner(page: import('@playwright/test').Page) {
+  const email = unique('owner') + '@example.com';
+  await page.goto('/login');
+  await page.getByRole('button', { name: '新規登録はこちら' }).click();
+  await page.getByLabel('表示名').fill('Owner');
+  await page.getByLabel('メールアドレス').fill(email);
+  await page.getByLabel('パスワード').fill('password123');
+  await page.getByRole('button', { name: '登録する' }).click();
+  await expect(page).toHaveURL(/\/dashboard/);
+  await page.getByLabel('プロジェクト名').fill(unique('Proj'));
+  await page.getByRole('button', { name: '新規プロジェクト' }).click();
+  await expect(page).toHaveURL(/\/projects\/\d+$/);
+  return Number(page.url().match(/\/projects\/(\d+)/)![1]);
+}
+
+test.describe('dashboard & search', () => {
+  test('personal dashboard, project dashboard, and search', async ({
+    page,
+  }) => {
+    const projectId = await setupOwner(page);
+    const keyword = unique('unicorn');
+
+    // データ作成: 掲示板スレッド + ToDo
+    await page.request.post(`/api/projects/${projectId}/board/threads`, {
+      data: { title: `thread ${keyword}`, bodyMd: 'body', category: 'notice' },
+    });
+    const cols = (
+      (await (
+        await page.request.get(`/api/projects/${projectId}/todos/columns`)
+      ).json()) as {
+        columns: { id: number }[];
+      }
+    ).columns;
+    await page.request.post(`/api/projects/${projectId}/todos/items`, {
+      data: {
+        title: `task ${keyword}`,
+        columnId: cols[0].id,
+        assigneeId: undefined,
+      },
+    });
+    // 自分(owner)のIDを取得してToDo担当にする
+    const me = (await (await page.request.get('/api/auth/me')).json()) as {
+      user: { id: number };
+    };
+    const items = (
+      (await (
+        await page.request.get(`/api/projects/${projectId}/todos/items`)
+      ).json()) as {
+        items: { id: number; title: string }[];
+      }
+    ).items;
+    const taskId = items.find((i) => i.title.includes(keyword))!.id;
+    await page.request.patch(
+      `/api/projects/${projectId}/todos/items/${taskId}`,
+      {
+        data: { assigneeId: me.user.id },
+      }
+    );
+
+    // 個人ダッシュボード: プロジェクト + 未完了ToDo
+    await page.goto('/dashboard');
+    await expect(page.getByText(unique('Proj').split('-')[0])).toBeVisible({
+      timeout: 10_000,
+    });
+    await expect(page.getByText(`task ${keyword}`)).toBeVisible();
+
+    // プロジェクトダッシュボード: 進行中ToDo + 最新掲示板
+    await page.goto(`/projects/${projectId}`);
+    await expect(page.getByText(`task ${keyword}`)).toBeVisible();
+    await expect(page.getByText(`thread ${keyword}`)).toBeVisible();
+
+    // 検索
+    await page.goto(
+      `/projects/${projectId}/search?q=${encodeURIComponent(keyword)}`
+    );
+    await expect(page.getByText(`thread ${keyword}`)).toBeVisible();
+    await expect(page.getByText(`task ${keyword}`)).toBeVisible();
+  });
+});