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/build.gradle.kts

@@ -1,22 +1,25 @@
 plugins {
     alias(libs.plugins.android.application)
     alias(libs.plugins.kotlin.android)
+    alias(libs.plugins.kotlin.compose)
+    alias(libs.plugins.kotlin.serialization)
+    alias(libs.plugins.ksp)
 }
 
 android {
-    namespace = "com.novasonic.app"
-    compileSdk = 34
+    namespace   = "com.novasonic.app"
+    compileSdk  = 35
 
     defaultConfig {
         applicationId = "com.novasonic.app"
-        minSdk = 24
-        targetSdk = 34
-        versionCode = 1
-        versionName = "1.0"
-        buildConfigField("String", "NOVASONIC_URL", "\"https://music.asianxpolish.duckdns.org\"")
+        minSdk        = 26
+        targetSdk     = 35
+        versionCode   = 1
+        versionName   = "1.0"
     }
 
     buildFeatures {
+        compose     = true
         buildConfig = true
     }
 
@@ -28,22 +31,68 @@ android {
     }
 
     compileOptions {
-        sourceCompatibility = JavaVersion.VERSION_1_8
-        targetCompatibility = JavaVersion.VERSION_1_8
+        sourceCompatibility = JavaVersion.VERSION_11
+        targetCompatibility = JavaVersion.VERSION_11
     }
 
     kotlinOptions {
-        jvmTarget = "1.8"
+        jvmTarget = "11"
     }
 }
 
 dependencies {
+    // Core
     implementation(libs.androidx.core.ktx)
     implementation(libs.androidx.appcompat)
-    implementation(libs.material)
+    implementation(libs.androidx.activity.compose)
+    implementation(libs.androidx.splashscreen)
+
+    // Compose
+    implementation(platform(libs.compose.bom))
+    implementation(libs.compose.ui)
+    implementation(libs.compose.ui.tooling.preview)
+    implementation(libs.compose.foundation)
+    implementation(libs.compose.material3)
+    implementation(libs.compose.icons)
+    debugImplementation(libs.compose.ui.tooling)
+
+    // Navigation
+    implementation(libs.navigation.compose)
+
+    // Lifecycle / ViewModel
+    implementation(libs.lifecycle.viewmodel.compose)
+    implementation(libs.lifecycle.runtime.compose)
+
+    // Media3
     implementation(libs.media3.exoplayer)
     implementation(libs.media3.session)
     implementation(libs.media3.common)
     implementation(libs.media3.datasource)
+    implementation(libs.media3.ui)
+
+    // Ktor
+    implementation(libs.ktor.client.core)
+    implementation(libs.ktor.client.android)
+    implementation(libs.ktor.client.content.neg)
+    implementation(libs.ktor.serialization.json)
+    implementation(libs.ktor.client.logging)
+
+    // Kotlinx
+    implementation(libs.kotlinx.serialization.json)
     implementation(libs.kotlinx.coroutines.android)
+    implementation(libs.kotlin.reflect)
+
+    // Room
+    implementation(libs.room.runtime)
+    implementation(libs.room.ktx)
+    ksp(libs.room.compiler)
+
+    // DataStore
+    implementation(libs.datastore.preferences)
+
+    // Coil
+    implementation(libs.coil.compose)
+
+    // Google Fonts (Outfit)
+    implementation(libs.compose.ui.google.fonts)
 }