docs: finalize navigation decoupling and unified cache rollout

apps/test/features/settings/ui/screens/settings_screen_test.dart

@@ -1,10 +1,14 @@
 import 'package:dio/dio.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
+import 'package:social_app/core/cache/hybrid_cache_store.dart';
+import 'package:social_app/core/cache/memory_cache_store.dart';
+import 'package:social_app/core/cache/persistent_cache_store.dart';
 import 'package:social_app/core/api/i_api_client.dart';
 import 'package:social_app/core/di/injection.dart';
 import 'package:social_app/features/friends/data/friends_api.dart';
 import 'package:social_app/features/settings/data/services/settings_user_cache.dart';
+import 'package:social_app/features/settings/data/services/user_profile_cache_repository.dart';
 import 'package:social_app/features/settings/ui/screens/settings_screen.dart';
 import 'package:social_app/features/users/data/models/user_response.dart';
 import 'package:social_app/features/users/data/users_api.dart';
@@ -78,10 +82,21 @@ void main() {
     if (sl.isRegistered<SettingsUserCache>()) {
       sl.unregister<SettingsUserCache>();
     }
+    if (sl.isRegistered<UserProfileCacheRepository>()) {
+      sl.unregister<UserProfileCacheRepository>();
+    }
     usersApi = _FakeUsersApi(apiClient);
+    final repository = UserProfileCacheRepository(
+      store: HybridCacheStore(
+        memory: MemoryCacheStore(),
+        persistent: PersistentCacheStore(),
+      ),
+      remoteLoader: usersApi.getMe,
+    );
     sl.registerSingleton<UsersApi>(usersApi);
     sl.registerSingleton<FriendsApi>(_FakeFriendsApi(apiClient));
-    sl.registerSingleton<SettingsUserCache>(SettingsUserCache());
+    sl.registerSingleton<UserProfileCacheRepository>(repository);
+    sl.registerSingleton<SettingsUserCache>(SettingsUserCache(repository));
   });
 
   tearDown(() async {
@@ -94,6 +109,9 @@ void main() {
     if (sl.isRegistered<SettingsUserCache>()) {
       await sl.unregister<SettingsUserCache>();
     }
+    if (sl.isRegistered<UserProfileCacheRepository>()) {
+      await sl.unregister<UserProfileCacheRepository>();
+    }
   });
 
   testWidgets('settings screen removes account row and shows logout button', (