feat: partial album split view + artist page full-screen + Bibliothek iTunes integration

- Partial album detail: tapping incomplete albums now shows downloaded songs
  (normal playback) above and missing iTunes tracks (30s preview + download)
  below — on both Android and web PWA
- Android: ItunesArtistScreen now renders full-screen above the tab/search bar
- Android: ArtistDetailScreen (Bibliothek) now loads iTunes data in parallel —
  adds Weltweit populär section and In Library/Unvollständig/Nicht heruntergeladen
  album sections identical to the Erkunden artist page
- Fix: artist no longer appears in its own Similar Artists row
- Fix: duplicate album entries deduplicated by collectionId in categorizeAlbums

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

android/app/src/main/AndroidManifest.xml

@@ -7,8 +7,10 @@
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE_MEDIA_PLAYBACK"/>
     <uses-permission android:name="android.permission.POST_NOTIFICATIONS"/>
     <uses-permission android:name="android.permission.WAKE_LOCK"/>
+    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
 
     <application
+        android:name=".NovaSonicApp"
         android:allowBackup="true"
         android:icon="@drawable/ic_launcher"
         android:label="@string/app_name"
@@ -20,7 +22,7 @@
         android:largeHeap="true">
 
         <activity
-            android:name=".MainActivity"
+            android:name=".ui.MainActivity"
             android:exported="true"
             android:configChanges="orientation|screenSize|keyboardHidden|smallestScreenSize|screenLayout"
             android:windowSoftInputMode="adjustResize"
@@ -32,7 +34,7 @@
         </activity>
 
         <service
-            android:name=".MusicService"
+            android:name=".player.MusicService"
             android:foregroundServiceType="mediaPlayback"
             android:exported="true">
             <intent-filter>
@@ -41,7 +43,7 @@
             </intent-filter>
         </service>
 
-        <!-- Android Auto support -->
+        <!-- Android Auto -->
         <meta-data
             android:name="com.google.android.gms.car.application"
             android:resource="@xml/automotive_app_desc"/>