feat(m11): calendar + milestones with progress calc, tests, e2e

- CalendarRepository (event CRUD, range query, soft-delete, project isolation)
  + MilestoneRepository (CRUD, findToDosByMilestone) + ScheduleService
  (aggregated getCalendarEvents = custom events+milestones+todos in range,
  milestone CRUD, milestone_updated activity, progress auto-calc 0-100)
- APIs: calendar events GET/POST/PATCH/DELETE, milestones GET/POST/PATCH +
  progress
- Screens: calendar list view + CalendarEventForm, milestones list with
  progress bars + MilestoneForm, ProjectNav links
- Unit tests (CalendarRepository, MilestoneRepository, ScheduleService incl.
  progress calc 0/33/100) + e2e calendar

tests/e2e/calendar.spec.ts

@@ -0,0 +1,99 @@
+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('calendar & milestones', () => {
+  test('milestone progress reflects related todo completion; calendar aggregates', async ({
+    page,
+  }) => {
+    const projectId = await setupOwner(page);
+    const now = new Date();
+    const y = now.getFullYear();
+    const m = String(now.getMonth() + 1).padStart(2, '0');
+    const midMonth = `${y}-${m}-15`;
+
+    // マイルストーン作成
+    const msRes = await page.request.post(
+      `/api/projects/${projectId}/milestones`,
+      { data: { title: unique('MS'), dueDate: midMonth } }
+    );
+    expect(msRes.ok()).toBeTruthy();
+    const { milestone } = (await msRes.json()) as { milestone: { id: number } };
+
+    // ToDoを作成しマイルストーンに紐付け
+    const cols = (
+      (await (
+        await page.request.get(`/api/projects/${projectId}/todos/columns`)
+      ).json()) as {
+        columns: { id: number }[];
+      }
+    ).columns;
+    const itemRes = await page.request.post(
+      `/api/projects/${projectId}/todos/items`,
+      {
+        data: { title: 'linked task', columnId: cols[0].id, dueDate: midMonth },
+      }
+    );
+    const { item } = (await itemRes.json()) as { item: { id: number } };
+    await page.request.patch(
+      `/api/projects/${projectId}/todos/items/${item.id}`,
+      {
+        data: { milestoneId: milestone.id },
+      }
+    );
+
+    // マイルストーン画面: 進捗 0%
+    await page.goto(`/projects/${projectId}/milestones`);
+    await expect(page.getByTestId(`milestone-${milestone.id}`)).toBeVisible();
+    await expect(
+      page.getByTestId(`milestone-progress-${milestone.id}`)
+    ).toHaveText('0%');
+
+    // ToDo完了 → 進捗 100%
+    await page.request.patch(
+      `/api/projects/${projectId}/todos/items/${item.id}`,
+      {
+        data: { toggleComplete: true },
+      }
+    );
+    await page.reload();
+    await expect(
+      page.getByTestId(`milestone-progress-${milestone.id}`)
+    ).toHaveText('100%');
+
+    // カレンダーイベント作成
+    const evRes = await page.request.post(
+      `/api/projects/${projectId}/calendar/events`,
+      {
+        data: {
+          title: unique('Event'),
+          type: 'custom',
+          startAt: `${midMonth}T10:00:00`,
+        },
+      }
+    );
+    expect(evRes.ok()).toBeTruthy();
+
+    // カレンダー画面にイベント+マイルストーン+ToDoが集約表示される
+    await page.goto(`/projects/${projectId}/calendar`);
+    await expect(page.getByText(/マイルストーン:/)).toBeVisible();
+    await expect(page.getByText(/ToDo:/)).toBeVisible();
+  });
+});