fix(android): use retrofit.create<T>() extension in provideLibraryApi

CI hit a KSP/Hilt resolution error on the prior commit:
  ModuleProcessingStep was unable to process 'NetworkModule' because
  'LibraryApi' could not be resolved.

Switching from `retrofit.create(LibraryApi::class.java)` to the Kotlin
extension `retrofit.create()` (with explicit `LibraryApi` return type
annotation). The extension is reified and may sidestep whatever
type-resolution path the previous form tripped under KSP2 + Hilt.

If this also fails, the next step is to split AlbumWire.kt and
ArtistWire.kt so each file has a single top-level declaration —
investigating cross-file symbol-resolution order in KSP2.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

android/app/src/main/java/com/fabledsword/minstrel/api/NetworkModule.kt

@@ -13,6 +13,7 @@ import okhttp3.MediaType.Companion.toMediaType
 import okhttp3.OkHttpClient
 import okhttp3.logging.HttpLoggingInterceptor
 import retrofit2.Retrofit
+import retrofit2.create
 import java.util.concurrent.TimeUnit
 import javax.inject.Singleton
 
@@ -73,8 +74,7 @@ object NetworkModule {
 
     @Provides
     @Singleton
-    fun provideLibraryApi(retrofit: Retrofit): LibraryApi =
-        retrofit.create(LibraryApi::class.java)
+    fun provideLibraryApi(retrofit: Retrofit): LibraryApi = retrofit.create()
 
     private const val CONNECT_TIMEOUT_SECONDS = 10L
     private const val READ_TIMEOUT_SECONDS = 30L