Remember playback choices & fix some track selection issues (#26)

Remembers changes in playback tracks across playbacks. So, if you change
the audio track, quit the app, and return to the same id, the app will
play the audio track previously chosen.

Additionally, this PR fixes a UI inconsistency when there are multiple
versions of a item. Previously sometimes the audio/subtitle tracks for
wrong version would be shown during playback.

app/build.gradle.kts

@@ -56,6 +56,7 @@ android {
         targetSdk = 36
         versionCode = getVersionCode()
         versionName = getAppVersion()
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
     }
 
     buildTypes {
@@ -217,6 +218,7 @@ dependencies {
     implementation(libs.androidx.lifecycle.viewmodel.navigation3)
     implementation(libs.androidx.hilt.navigation.compose)
     implementation(libs.androidx.preference.ktx)
+    implementation(libs.androidx.room.testing)
     ksp(libs.androidx.room.compiler)
     ksp(libs.hilt.android.compiler)