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/calls/domain/call_state.dart

@@ -0,0 +1,19 @@
+// Version: 1.0.0 | Created: 2026-04-01
+// Call state sealed hierarchy. LiveKit integration in Phase 2.
+
+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'call_state.freezed.dart';
+
+@freezed
+sealed class CallState with _$CallState {
+  const factory CallState.idle() = CallIdle;
+  const factory CallState.connecting({required String roomId}) = CallConnecting;
+  const factory CallState.active({
+    required String roomId,
+    required Duration duration,
+    @Default(false) bool isVideoEnabled,
+    @Default(true) bool isAudioEnabled,
+  }) = CallActive;
+  const factory CallState.ended({String? reason}) = CallEnded;
+}