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/auth/presentation/login_controller.dart

@@ -0,0 +1,39 @@
+// Version: 1.0.0 | Created: 2026-04-01
+// Riverpod controller for the login form.
+// Owns the loading state visible to the login screen widget.
+
+import 'package:riverpod_annotation/riverpod_annotation.dart';
+
+import '../../../core/auth/auth_notifier.dart';
+import '../../../core/auth/auth_state.dart';
+
+part 'login_controller.g.dart';
+
+@riverpod
+class LoginController extends _$LoginController {
+  @override
+  bool build() => false; // isLoading
+
+  /// Delegates to [AuthNotifier.login]. Returns the failure message if any,
+  /// or null on success.
+  Future<String?> login({
+    required String username,
+    required String password,
+  }) async {
+    state = true;
+    try {
+      await ref
+          .read(authProvider.notifier)
+          .login(username: username, password: password);
+
+      // Check if auth failed.
+      final authState = ref.read(authProvider);
+      return authState.maybeWhen(
+        unauthenticated: (failure) => failure,
+        orElse: () => null,
+      );
+    } finally {
+      state = false;
+    }
+  }
+}