Implement multi-screen app UI flow and navigation

docs/progress.md

@@ -1,6 +1,56 @@
 # Relationship Saver Progress Log
 
-Updated: 2026-02-14
+Updated: 2026-02-15
+
+## Latest Milestone (2026-02-15): Product UI Flow Implemented
+
+The app now has a real multi-screen user experience on macOS (and other platforms), not just a placeholder screen.
+
+Delivered UI architecture:
+
+- App shell with responsive navigation:
+  - desktop: left sidebar + content pane
+  - compact: bottom navigation
+- Views implemented:
+  - Dashboard
+  - People
+  - Moments
+  - Signals
+  - Sync
+  - Settings
+- Reference-aligned visual style:
+  - WorkSans typography (copied from the UI reference assets)
+  - soft gradients, rounded glass-like cards, accent palette similar to the reference repo
+- Offline-safe UX:
+  - fake backend mode now defaults to `true` unless overridden via `--dart-define=USE_FAKE_BACKEND=false`
+  - signals view gracefully falls back to local recommendations when backend calls fail
+
+Key new files:
+
+- `lib/features/home/app_shell.dart`
+- `lib/features/dashboard/dashboard_view.dart`
+- `lib/features/people/people_view.dart`
+- `lib/features/moments/moments_view.dart`
+- `lib/features/signals/signals_controller.dart`
+- `lib/features/signals/signals_view.dart`
+- `lib/features/sync/sync_view.dart`
+- `lib/features/settings/settings_view.dart`
+- `lib/features/shared/frosted_card.dart`
+- `lib/features/local/local_models.dart`
+- `lib/features/local/local_repository.dart`
+- `assets/fonts/WorkSans-*.ttf`
+
+Other updates:
+
+- `lib/main.dart` now launches the new app shell.
+- `lib/core/config/app_theme.dart` updated to a stronger visual system.
+- `pubspec.yaml` includes local WorkSans font family.
+- `test/widget_test.dart` updated for the new flow.
+
+Validation status after UI milestone:
+
+- `flutter analyze` -> pass
+- `flutter test` -> pass
 
 ## Current Status
 
@@ -165,10 +215,10 @@ Most recent local checks:
 
 ### Priority 3: App Wiring + UX
 
-1. Wire `BackendGateway` into app services/use cases (not UI widgets directly).
-2. Add session state provider (signed in / expired / signed out).
-3. Add explicit offline indicators and non-blocking sync status UI.
-4. Start consuming fake gateway in feature screens before live backend.
+1. Replace local demo repository data with actual local DB repositories.
+2. Add create/edit flows for people, captures, reminders, and ideas (forms + validation).
+3. Add session state and auth entry screens (sign-in, expired-session recovery).
+4. Add explicit offline badges and sync conflict resolution UI.
 
 ### Priority 4: Security + Hardening