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>

PROGRESS.md

@@ -31,9 +31,19 @@ See PROJECT_PLAN.md for the full step list.
 - Foojay resolver added for automatic JDK toolchain download
 - compileSdk/targetSdk bumped to 36 (required by latest androidx dependencies)
 
+### Phase 2: Notebook List Screen (2026-03-24)
+
+- [x] 2.1: MainActivity with Compose NavHost (three routes: notebooks, pages, editor)
+- [x] 2.2: NotebookListViewModel with StateFlow, create/delete operations
+- [x] 2.3: NotebookListScreen — lazy list, create dialog (title + page size radio),
+  long-press delete with confirmation, empty state
+- [x] 2.4: Auto-create page 1 in NotebookRepository.create()
+- [x] 2.5: Navigation wired — tap notebook → pages stub, editor stub
+- EngPadTheme: high-contrast light color scheme (black on white for e-ink)
+
 ## In Progress
 
-Phase 2: Notebook List Screen
+Phase 3: Canvas — Basic Drawing
 
 ## Decisions & Deviations