Several UI/UX minor changes (#1623)

## Description
Gathering some smaller UI/UX changes:
- Default to the user's preferred subtitle language when
searching/downloading subtitles and if unset, fall back to the UI's
language
- Only show >0s runtime on quick details & don't show negative ends at
- On the OS channel row for recently added, only include movies &
episodes
- Only show movies & episodes to "Recently Added" Android OS channel
- Fix context menu for adding songs & albums to the music queue

### Related issues
Related to #1339 & #1484
Fixes #1617
Fixes
https://github.com/damontecres/Wholphin/issues/1329#issuecomment-4440684328

### Testing
Just on the emulator

## Screenshots
N/A

## AI or LLM usage
None

app/src/main/java/com/github/damontecres/wholphin/data/model/BaseItem.kt

@@ -160,6 +160,7 @@ data class BaseItem(
                                     data.runTimeTicks
                                         ?.ticks
                                         ?.roundMinutes
+                                        ?.takeIf { it > Duration.ZERO }
                                         ?.let { add(it.toString()) }
                                     data.timeRemaining
                                         ?.roundMinutes