feat(series): add long-click context menu to episode cards

Add a ModalBottomSheet with Mark as watched/unwatched actions on long-click of episode cards.

- Replace clickable with combinedClickable to support long-click gestures
- Add markEpisodeAsWatched function to SeriesViewModel
- Add MediaAction model usage for bottom sheet actions
- Add test tag for the dialog component

core/src/main/java/hu/bbara/purefin/core/feature/content/series/SeriesViewModel.kt

@@ -186,6 +186,12 @@ class SeriesViewModel @Inject constructor(
         }
     }
 
+    fun markEpisodeAsWatched(episodeId: UUID, watched: Boolean) {
+        viewModelScope.launch {
+            mediaMetadataUpdater.markAsWatched(episodeId, watched)
+        }
+    }
+
     fun selectSeries(series: SeriesDto) {
         _series.value = series
         viewModelScope.launch {