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/tasks_provider.dart

@@ -0,0 +1,49 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import '../data/models/task.dart';
+import 'api_client_provider.dart';
+
+final tasksProvider =
+    AsyncNotifierProvider<TasksNotifier, List<Task>>(TasksNotifier.new);
+
+class TasksNotifier extends AsyncNotifier<List<Task>> {
+  @override
+  Future<List<Task>> build() async {
+    return ref.watch(tasksRepositoryProvider).getAll();
+  }
+
+  Future<Task> create({
+    required String title,
+    String? description,
+    required TaskStatus status,
+    required TaskPriority priority,
+    DateTime? dueDate,
+  }) async {
+    final task = await ref.read(tasksRepositoryProvider).create(
+          title: title,
+          description: description,
+          status: status,
+          priority: priority,
+          dueDate: dueDate,
+        );
+    state = AsyncData([...state.valueOrNull ?? [], task]);
+    return task;
+  }
+
+  Future<Task> updateTask(int id, Map<String, dynamic> fields) async {
+    final updated = await ref.read(tasksRepositoryProvider).update(id, fields);
+    state = AsyncData([
+      for (final t in state.valueOrNull ?? [])
+        if (t.id == id) updated else t,
+    ]);
+    return updated;
+  }
+
+  Future<void> delete(int id) async {
+    await ref.read(tasksRepositoryProvider).delete(id);
+    state = AsyncData([
+      for (final t in state.valueOrNull ?? [])
+        if (t.id != id) t,
+    ]);
+  }
+}