Phase 3: Wire page stubs into working screens with full integration

Implemented 4 page stubs with hooks and components:
- Dashboard: displays overview metrics, planned days breakdown, progress chart, break periods
- Calendar: month-based calendar grid with event badges and navigation
- Tips: list of optimization tips with dismiss functionality
- Settings: workspace configuration with child info, parent profile, vacation days, break periods

Added utility exports:
- src/context/index.ts: re-exports useAuth, useWorkspace hooks
- src/hooks/index.ts: re-exports all domain hooks

All pages:
- Use Layout wrapper with header configuration
- Load data via hooks with loading/error states
- Render presentational components (no business logic)
- Pass callbacks for user actions
- Type-safe with full @types coverage

Frontend test coverage: 167 tests, all passing
TypeScript: zero errors, lint: zero errors

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -33,8 +33,8 @@ jobs:
         run: uv run ruff format --check .
 
       - name: Test with coverage
-        # Target is 90; raise this threshold as junior feature tests land.
-        run: uv run pytest --cov=app --cov-report=term-missing --cov-fail-under=40
+        # Target is 90; raise toward it as tests land (tips rules: 40→50).
+        run: uv run pytest --cov=app --cov-report=term-missing --cov-fail-under=50
 
   # ---------------------------------------------------------------------------
   # Frontend: ESLint + Vitest with 90% coverage gate