feat: Phase 2 complete — calls, media, spaces, persistence, chat improvements

- LiveKit/MatrixRTC voice+video calls with full call screen UI
- Incoming call overlay (accept/decline)
- Media upload/download — file picker, image rendering, file download
- Spaces navigation — space list + expandable child rooms
- Drift persistence — rooms + messages written on every sync
- Sync persistence auto-starts on login and session restore
- Chat: typing indicators, long-press menu, reply, emoji reactions
- User search dialog + start DM from rooms screen
- Android: INTERNET + CAMERA + RECORD_AUDIO permissions in main manifest
- Emoji picker for reactions

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

lib/features/chat/presentation/chat_controller.dart

@@ -1,6 +1,7 @@
-// Version: 1.0.0 | Created: 2026-04-01
-// Riverpod providers for chat timeline.
+// Version: 1.1.0 | Created: 2026-04-01
+// Riverpod providers for chat timeline, send, upload, react, reply.
 
+import 'package:matrix/matrix.dart' show MatrixFile;
 import 'package:riverpod_annotation/riverpod_annotation.dart';
 
 import '../data/chat_repository.dart';
@@ -16,16 +17,83 @@ Stream<List<MessageModel>> chatTimeline(Ref ref, String roomId) {
 }
 
 /// Sends a text message. Returns an error string on failure, null on success.
+/// Also handles sending replies when [inReplyToEventId] is set.
 @riverpod
 class SendMessage extends _$SendMessage {
   @override
   bool build() => false; // isSending
 
-  Future<String?> send(String roomId, String text) async {
+  Future<String?> send(
+    String roomId,
+    String text, {
+    String? inReplyToEventId,
+  }) async {
     if (text.trim().isEmpty) return null;
     state = true;
     try {
-      await ref.read(chatRepositoryProvider).sendTextMessage(roomId, text);
+      await ref
+          .read(chatRepositoryProvider)
+          .sendTextMessage(roomId, text, inReplyToEventId: inReplyToEventId);
+      return null;
+    } on Exception catch (e) {
+      return e.toString();
+    } finally {
+      state = false;
+    }
+  }
+}
+
+/// Uploads a file and sends it as a room message.
+/// State: null = idle, empty string = uploading, non-empty = error message.
+@riverpod
+class UploadFile extends _$UploadFile {
+  @override
+  String? build() => null; // null = idle
+
+  Future<void> upload(String roomId, MatrixFile file) async {
+    state = ''; // uploading
+    try {
+      await ref.read(chatRepositoryProvider).sendFile(roomId, file);
+      state = null; // success — back to idle
+    } on Exception catch (e) {
+      state = e.toString(); // error
+    }
+  }
+
+  void clearError() => state = null;
+}
+
+/// Sends an emoji reaction to [eventId].
+@riverpod
+class SendReaction extends _$SendReaction {
+  @override
+  bool build() => false;
+
+  Future<String?> react(String roomId, String eventId, String emoji) async {
+    state = true;
+    try {
+      await ref
+          .read(chatRepositoryProvider)
+          .sendReaction(roomId, eventId, emoji);
+      return null;
+    } on Exception catch (e) {
+      return e.toString();
+    } finally {
+      state = false;
+    }
+  }
+}
+
+/// Deletes (redacts) a message by eventId.
+@riverpod
+class DeleteMessage extends _$DeleteMessage {
+  @override
+  bool build() => false;
+
+  Future<String?> delete(String roomId, String eventId) async {
+    state = true;
+    try {
+      await ref.read(chatRepositoryProvider).redactEvent(roomId, eventId);
       return null;
     } on Exception catch (e) {
       return e.toString();