feat(KIN-012): UI auto/review mode toggle, autopilot indicator, persist project mode in DB

- TaskDetail: hide Approve/Reject buttons in auto mode, show "Автопилот активен" badge
- TaskDetail: execution_mode persisted per-task via PATCH /api/tasks/{id}
- TaskDetail: loadMode reads DB value, falls back to localStorage per project
- TaskDetail: back navigation preserves status filter via ?back_status query param
- ProjectView: toggleMode now persists to DB via PATCH /api/projects/{id}
- ProjectView: loadMode reads project.execution_mode from DB first
- ProjectView: task list shows 🔓 badge for auto-mode tasks
- ProjectView: status filter synced to URL query param ?status=
- api.ts: add patchProject(), execution_mode field on Project interface
- core/db.py, core/models.py: execution_mode columns + migration for projects & tasks
- web/api.py: PATCH /api/projects/{id} and PATCH /api/tasks/{id} support execution_mode
- tests: 256 tests pass, new test_auto_mode.py with 60+ auto mode tests
- frontend: vitest config added for component tests

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web/frontend/vite.config.ts

@@ -4,4 +4,8 @@ import vue from '@vitejs/plugin-vue'
 // https://vite.dev/config/
 export default defineConfig({
   plugins: [vue()],
+  test: {
+    environment: 'jsdom',
+    globals: true,
+  },
 })