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/providers/api_client_provider.dart

@@ -0,0 +1,57 @@
+import 'package:cookie_jar/cookie_jar.dart';
+import 'package:dio/dio.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import '../data/api/api_client.dart';
+import '../data/api/auth_api.dart';
+import '../data/api/chat_api.dart';
+import '../data/api/notes_api.dart';
+import '../data/api/tasks_api.dart';
+import '../data/repositories/auth_repository.dart';
+import '../data/repositories/chat_repository.dart';
+import '../data/repositories/notes_repository.dart';
+import '../data/repositories/tasks_repository.dart';
+import 'settings_provider.dart';
+
+final cookieJarProvider = Provider<PersistCookieJar>((ref) {
+  final cookiesPath = ref.watch(cookiesPathProvider);
+  return buildCookieJar(cookiesPath);
+});
+
+final dioProvider = Provider<Dio>((ref) {
+  final url = ref.watch(serverUrlProvider) ?? '';
+  final jar = ref.watch(cookieJarProvider);
+  return buildDio(url, jar);
+});
+
+final authApiProvider = Provider<AuthApi>((ref) {
+  return AuthApi(ref.watch(dioProvider));
+});
+
+final notesApiProvider = Provider<NotesApi>((ref) {
+  return NotesApi(ref.watch(dioProvider));
+});
+
+final tasksApiProvider = Provider<TasksApi>((ref) {
+  return TasksApi(ref.watch(dioProvider));
+});
+
+final chatApiProvider = Provider<ChatApi>((ref) {
+  return ChatApi(ref.watch(dioProvider));
+});
+
+final authRepositoryProvider = Provider<AuthRepository>((ref) {
+  return AuthRepository(ref.watch(authApiProvider));
+});
+
+final notesRepositoryProvider = Provider<NotesRepository>((ref) {
+  return NotesRepository(ref.watch(notesApiProvider));
+});
+
+final tasksRepositoryProvider = Provider<TasksRepository>((ref) {
+  return TasksRepository(ref.watch(tasksApiProvider));
+});
+
+final chatRepositoryProvider = Provider<ChatRepository>((ref) {
+  return ChatRepository(ref.watch(chatApiProvider));
+});