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/app/app.dart

@@ -0,0 +1,31 @@
+// Version: 1.0.0 | Created: 2026-04-01
+// Root MaterialApp widget. Wires together theme + router.
+
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import 'router.dart';
+import 'theme.dart';
+
+/// Root application widget.
+///
+/// [ProviderScope] is set up in main.dart. This widget only handles
+/// theme and routing — no business logic here.
+class M8ChatApp extends ConsumerWidget {
+  const M8ChatApp({super.key});
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final router = ref.watch(routerProvider);
+
+    return MaterialApp.router(
+      title: 'M8Chat',
+      theme: buildLightTheme(),
+      darkTheme: buildDarkTheme(),
+      // Default to dark — M8Chat is a dark-first chat app.
+      themeMode: ThemeMode.system,
+      routerConfig: router,
+      debugShowCheckedModeBanner: false,
+    );
+  }
+}