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>

pubspec.yaml

@@ -1,7 +1,7 @@
 name: m8chat_app
 description: "M8Chat — Matrix chat client for Android, iOS, and Web."
 publish_to: 'none'
-version: 1.0.0+1
+version: 1.1.0+2
 
 environment:
   sdk: '>=3.11.0 <4.0.0'
@@ -33,6 +33,15 @@ dependencies:
   livekit_client: ^2.4.0
   flutter_webrtc: ^0.12.0
 
+  # HTTP client (used directly in LiveKit JWT fetch)
+  http: ^1.0.0
+
+  # Media upload
+  file_picker: ^8.0.0
+
+  # Emoji reactions
+  emoji_picker_flutter: ^4.0.0
+
   # UI
   cached_network_image: ^3.4.0
   timeago: ^3.7.0