feat: in-app update downloader with progress, Gitea auto-push hook

- update_checker: Gitea at git.steggi-matrix.work, Windows + Android support, asset URL detection
- update_download_dialog: animated Pyramid logo, progress bar, platform install (exe/apk)
- update_banner: Herunterladen button triggers dialog, dismiss option
- Android: REQUEST_INSTALL_PACKAGES permission + FileProvider for APK install
- post-commit hook: auto-push to Gitea on every commit
- chat_input: larger send button (60px desktop), more padding, bigger icon
- rooms_panel: space menu visible on mobile (leave space fix)
- docs: feature-checklist.md added

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

android/app/src/main/AndroidManifest.xml

@@ -1,8 +1,24 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <uses-permission android:name="android.permission.INTERNET"/>
+    <uses-permission android:name="android.permission.RECORD_AUDIO"/>
+    <uses-permission android:name="android.permission.CAMERA"/>
+    <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS"/>
+    <uses-permission android:name="android.permission.BLUETOOTH" android:maxSdkVersion="30"/>
+    <uses-permission android:name="android.permission.BLUETOOTH_CONNECT"/>
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_MEDIA_PROJECTION" />
+    <uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES"/>
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" android:maxSdkVersion="28"/>
+
     <application
         android:label="pyramid"
         android:name="${applicationName}"
         android:icon="@mipmap/ic_launcher">
+        <service
+            android:name="com.cloudwebrtc.webrtc.FlutterForegroundService"
+            android:enabled="true"
+            android:exported="false"
+            android:foregroundServiceType="mediaProjection" />
         <activity
             android:name=".MainActivity"
             android:exported="true"
@@ -25,6 +41,16 @@
                 <category android:name="android.intent.category.LAUNCHER"/>
             </intent-filter>
         </activity>
+        <!-- FileProvider for APK installs (update downloader) -->
+        <provider
+            android:name="androidx.core.content.FileProvider"
+            android:authorities="${applicationId}.fileprovider"
+            android:exported="false"
+            android:grantUriPermissions="true">
+            <meta-data
+                android:name="android.support.FILE_PROVIDER_PATHS"
+                android:resource="@xml/file_paths"/>
+        </provider>
         <!-- Don't delete the meta-data below.
              This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
         <meta-data

android/app/src/main/res/xml/file_paths.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<paths>
+    <cache-path name="pyramid_downloads" path="downloads/"/>
+    <external-cache-path name="pyramid_ext_downloads" path="downloads/"/>
+</paths>