Initial commit: Fabled Android app

Flutter Android client for FabledAssistant with:
- Session-cookie auth via persistent cookie jar (Dio + cookie_jar)
- OAuth/SSO login via in-app WebView (flutter_inappwebview)
- Notes: list, detail (markdown render), create/edit
- Tasks: list with status tabs, create/edit with priority
- Chat: SSE streaming bubbles, conversation management
- Quick Capture FAB for rapid note/task creation
- Settings screen (change server URL, logout)
- Android home screen widget → opens chat
- Riverpod state management, go_router navigation

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/data/repositories/chat_repository.dart

@@ -0,0 +1,19 @@
+import '../api/chat_api.dart';
+import '../models/conversation.dart';
+import '../models/message.dart';
+
+class ChatRepository {
+  final ChatApi _api;
+  const ChatRepository(this._api);
+
+  Future<List<Conversation>> getConversations() => _api.getConversations();
+  Future<Conversation> createConversation(String title) =>
+      _api.createConversation(title);
+  Future<void> deleteConversation(int id) => _api.deleteConversation(id);
+  Future<List<Message>> getMessages(int conversationId) =>
+      _api.getMessages(conversationId);
+  Future<void> sendMessage(int conversationId, String content) =>
+      _api.sendMessage(conversationId, content);
+  Stream<String> streamGeneration(int conversationId) =>
+      _api.streamGeneration(conversationId);
+}