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/rooms/domain/room_model.dart

@@ -0,0 +1,21 @@
+// Version: 1.0.0 | Created: 2026-04-01
+// Immutable room model. Wraps the data the rooms screen needs to display.
+// Derived from the Matrix SDK's Room object in the repository layer.
+
+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'room_model.freezed.dart';
+
+@freezed
+abstract class RoomModel with _$RoomModel {
+  const factory RoomModel({
+    required String id,
+    required String displayName,
+    String? avatarUrl,
+    String? lastMessagePreview,
+    DateTime? lastActivityAt,
+    @Default(0) int unreadCount,
+    @Default(false) bool isDirectMessage,
+    @Default(false) bool isDirect,
+  }) = _RoomModel;
+}