feat(android): Hilt application + AppModule (Json + ApplicationScope)

M8 phase 1.3. Plants the Hilt entrypoint so the rest of the modules
(NetworkModule, DatabaseModule, PlayerModule) can land in subsequent
phases. WorkerFactory wired so HiltWorker can be used directly later.

Restores @AndroidEntryPoint on MainActivity (deferred from 1.2 since
Hilt KSP errors without an annotated Application class).

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

android/app/src/main/java/com/fabledsword/minstrel/MainActivity.kt

@@ -10,9 +10,9 @@ import androidx.compose.material3.Scaffold
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Modifier
+import dagger.hilt.android.AndroidEntryPoint
 
-// @AndroidEntryPoint added in Task 1.3 alongside @HiltAndroidApp on MinstrelApplication
-// (Hilt KSP errors without an annotated Application class).
+@AndroidEntryPoint
 class MainActivity : ComponentActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)

android/app/src/main/java/com/fabledsword/minstrel/MinstrelApplication.kt

@@ -0,0 +1,23 @@
+package com.fabledsword.minstrel
+
+import android.app.Application
+import androidx.hilt.work.HiltWorkerFactory
+import androidx.work.Configuration
+import dagger.hilt.android.HiltAndroidApp
+import timber.log.Timber
+import javax.inject.Inject
+
+@HiltAndroidApp
+class MinstrelApplication : Application(), Configuration.Provider {
+    @Inject lateinit var workerFactory: HiltWorkerFactory
+
+    override fun onCreate() {
+        super.onCreate()
+        if (BuildConfig.DEBUG) Timber.plant(Timber.DebugTree())
+    }
+
+    override val workManagerConfiguration: Configuration
+        get() = Configuration.Builder()
+            .setWorkerFactory(workerFactory)
+            .build()
+}

android/app/src/main/java/com/fabledsword/minstrel/di/AppModule.kt

@@ -0,0 +1,33 @@
+package com.fabledsword.minstrel.di
+
+import dagger.Module
+import dagger.Provides
+import dagger.hilt.InstallIn
+import dagger.hilt.components.SingletonComponent
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.SupervisorJob
+import kotlinx.serialization.json.Json
+import javax.inject.Qualifier
+import javax.inject.Singleton
+
+@Qualifier
+@Retention(AnnotationRetention.BINARY)
+annotation class ApplicationScope
+
+@Module
+@InstallIn(SingletonComponent::class)
+object AppModule {
+    @Provides
+    @Singleton
+    fun provideJson(): Json = Json {
+        ignoreUnknownKeys = true
+        explicitNulls = false
+        coerceInputValues = true
+    }
+
+    @Provides
+    @Singleton
+    @ApplicationScope
+    fun provideAppScope(): CoroutineScope = CoroutineScope(SupervisorJob() + Dispatchers.Default)
+}