feat: Phase 1 complete — Matrix login, rooms, chat, profile

- Direct m.login.password auth against matrix.m8chat.au
- Room list with unread badges, last message, timestamps
- Chat timeline (text, images, files, replies, reactions)
- Profile screen with expandable Notifications and Security sections
- Olm E2EE initialisation (web WASM bootstrap)
- Global error handler preventing Matrix SDK crashes
- GoRouter with refreshListenable (no recreation on auth change)
- Feature-first clean architecture: Riverpod + GoRouter + Drift
- Deployed to https://app2.m8chat.au

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

lib/features/chat/presentation/chat_controller.dart

@@ -0,0 +1,36 @@
+// Version: 1.0.0 | Created: 2026-04-01
+// Riverpod providers for chat timeline.
+
+import 'package:riverpod_annotation/riverpod_annotation.dart';
+
+import '../data/chat_repository.dart';
+import '../domain/message_model.dart';
+
+part 'chat_controller.g.dart';
+
+/// Streams the message list for [roomId].
+@riverpod
+Stream<List<MessageModel>> chatTimeline(Ref ref, String roomId) {
+  final repo = ref.watch(chatRepositoryProvider);
+  return repo.watchTimeline(roomId);
+}
+
+/// Sends a text message. Returns an error string on failure, null on success.
+@riverpod
+class SendMessage extends _$SendMessage {
+  @override
+  bool build() => false; // isSending
+
+  Future<String?> send(String roomId, String text) async {
+    if (text.trim().isEmpty) return null;
+    state = true;
+    try {
+      await ref.read(chatRepositoryProvider).sendTextMessage(roomId, text);
+      return null;
+    } on Exception catch (e) {
+      return e.toString();
+    } finally {
+      state = false;
+    }
+  }
+}