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>

android/app/src/main/AndroidManifest.xml

@@ -1,4 +1,14 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <!-- Network access — MUST be in main manifest; release builds ignore debug manifest -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+
+    <!-- Voice and video calls -->
+    <uses-permission android:name="android.permission.CAMERA"/>
+    <uses-permission android:name="android.permission.RECORD_AUDIO"/>
+    <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS"/>
+    <uses-permission android:name="android.permission.BLUETOOTH_CONNECT"/>
+
     <application
         android:label="m8chat_app"
         android:name="${applicationName}"
@@ -14,7 +24,7 @@
             android:windowSoftInputMode="adjustResize">
             <!-- Specifies an Android theme to apply to this Activity as soon as
                  the Android process has started. This theme is visible to the user
-                 while the Flutter UI initializes. After that, this theme continues
+                 while the Flutter UI initialises. After that, this theme continues
                  to determine the Window background behind the Flutter UI. -->
             <meta-data
               android:name="io.flutter.embedding.android.NormalTheme"