refactor: centralize playable media state

Move playback-related media state into shared model types and make the player consume a single PlayableMedia object instead of separately loading MediaItems, track preferences, resume positions, and media segments.

This updates PlayableMediaRepository to return playable media bundles, seeds the player playlist with the current item, keeps next-up entries in the same model, restores resume/segment handling, and fixes current queue highlighting.

The change also moves track preference models into core-model, centralizes Jellyfin BaseItemDto conversion, removes placeholder movie audio/subtitle fields, bumps the offline Room schema, and updates mobile/TV queue UI code for the playlist model.

Verification:
./gradlew --no-daemon :core-model:compileDebugKotlin :core:compileDebugKotlin :data:compileDebugKotlin :app:compileDebugKotlin

app/src/main/java/hu/bbara/purefin/ui/screen/movie/MovieScreen.kt

@@ -30,19 +30,19 @@ import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import androidx.hilt.navigation.compose.hiltViewModel
-import hu.bbara.purefin.ui.screen.waiting.PurefinWaitingScreen
-import hu.bbara.purefin.ui.common.media.MediaHero
-import hu.bbara.purefin.ui.common.media.MediaMetadataFlowRow
 import hu.bbara.purefin.download.DownloadState
+import hu.bbara.purefin.feature.content.movie.MovieScreenViewModel
+import hu.bbara.purefin.image.ArtworkKind
 import hu.bbara.purefin.image.ImageUrlBuilder
-import hu.bbara.purefin.navigation.MovieDto
 import hu.bbara.purefin.model.CastMember
 import hu.bbara.purefin.model.Movie
-import hu.bbara.purefin.feature.content.movie.MovieScreenViewModel
+import hu.bbara.purefin.navigation.MovieDto
+import hu.bbara.purefin.ui.common.media.MediaHero
+import hu.bbara.purefin.ui.common.media.MediaMetadataFlowRow
 import hu.bbara.purefin.ui.screen.movie.components.MovieDetails
 import hu.bbara.purefin.ui.screen.movie.components.MovieTopBar
+import hu.bbara.purefin.ui.screen.waiting.PurefinWaitingScreen
 import hu.bbara.purefin.ui.theme.AppTheme
-import hu.bbara.purefin.image.ArtworkKind
 import java.util.UUID
 
 @Composable
@@ -202,8 +202,6 @@ private fun previewMovie(): Movie =
         format = "Dolby Vision",
         synopsis = "A new blade runner uncovers a buried secret that forces him to trace the vanished footsteps of Rick Deckard.",
         imageUrlPrefix = "https://images.unsplash.com/photo-1519608487953-e999c86e7455",
-        audioTrack = "English 5.1",
-        subtitles = "English CC",
         cast = listOf(
             CastMember("Ryan Gosling", "K", null),
             CastMember("Ana de Armas", "Joi", null),

app/src/main/java/hu/bbara/purefin/ui/screen/movie/components/MovieComponents.kt

@@ -125,8 +125,8 @@ internal fun MovieDetails(
         MediaPlaybackSettings(
             backgroundColor = MaterialTheme.colorScheme.surface,
             foregroundColor = MaterialTheme.colorScheme.onSurface,
-            audioTrack = movie.audioTrack,
-            subtitles = movie.subtitles
+            audioTrack = "ENG",
+            subtitles = "ENG"
         )
 
         if (movie.cast.isNotEmpty()) {

app/src/main/java/hu/bbara/purefin/ui/screen/player/components/PlayerQueuePanel.kt

@@ -1,5 +1,4 @@
 package hu.bbara.purefin.ui.screen.player.components
-
 import androidx.compose.animation.AnimatedVisibility
 import androidx.compose.animation.fadeIn
 import androidx.compose.animation.fadeOut
@@ -30,8 +29,8 @@ import androidx.compose.ui.draw.clip
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
-import hu.bbara.purefin.ui.common.image.PurefinAsyncImage
 import hu.bbara.purefin.player.model.PlayerUiState
+import hu.bbara.purefin.ui.common.image.PurefinAsyncImage
 
 @Composable
 fun PlayerQueuePanel(
@@ -83,7 +82,6 @@ fun PlayerQueuePanel(
                         items(uiState.queue, key = { item -> item.id }) { item ->
                             QueueRow(
                                 title = item.title,
-                                subtitle = item.subtitle,
                                 artworkUrl = item.artworkUrl,
                                 isCurrent = item.isCurrent,
                                 onClick = { onSelect(item.id) }
@@ -105,7 +103,7 @@ fun PlayerQueuePanel(
 @Composable
 private fun QueueRow(
     title: String,
-    subtitle: String?,
+    subtitle: String? = null,
     artworkUrl: String?,
     isCurrent: Boolean,
     onClick: () -> Unit