Implement Phase 2: notebook list screen with navigation

- NotebookListScreen: lazy list, create dialog (title + page size),
  long-press delete with confirmation, empty state
- NotebookListViewModel: StateFlow-based, create/delete operations
- EngPadTheme: high-contrast light scheme for e-ink displays
- NavGraph: three routes (notebooks, pages stub, editor stub)
- MainActivity wired to NavHost with database injection

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

PROJECT_PLAN.md

@@ -35,16 +35,16 @@ completed and log them in PROGRESS.md.
 
 ## Phase 2: Notebook List Screen
 
-- [ ] 2.1: Set up `MainActivity` with Compose and `NavHost`
+- [x] 2.1: Set up `MainActivity` with Compose and `NavHost`
   - `MainActivity.kt`, `ui/navigation/NavGraph.kt`, `ui/theme/Theme.kt`
-- [ ] 2.2: Implement `NotebookListViewModel`
+- [x] 2.2: Implement `NotebookListViewModel`
   - `ui/notebooks/NotebookListViewModel.kt`
-- [ ] 2.3: Implement `NotebookListScreen`
-  - `ui/notebooks/NotebookListScreen.kt` — list, create dialog, delete
-- [ ] 2.4: Auto-create page 1 on notebook creation
-  - In `NotebookRepository` or ViewModel
-- [ ] 2.5: Navigation: tap notebook → page list (stub screen)
-- **Verify:** `./gradlew build && ./gradlew test`
+- [x] 2.3: Implement `NotebookListScreen`
+  - `ui/notebooks/NotebookListScreen.kt` — list, create dialog, delete confirmation
+- [x] 2.4: Auto-create page 1 on notebook creation
+  - In `NotebookRepository.create()`
+- [x] 2.5: Navigation: tap notebook → page list (stub screen)
+- **Verify:** `./gradlew build` — PASSED (build + test + lint)
 
 ## Phase 3: Canvas — Basic Drawing