## Description
This PR has updates the Now Playing page.
Now only the song's backdrops and the song's artists' backdrops will
show. First, if the song has any backdrops (probably pretty uncommon),
they will be shuffled and shown, then if the song's artists have
backdrop, those are shuffled and shown. The backdrop changes every 2
minutes unless there's <15s left in the song to prevent rapid changes.
Note: album backdrops and album artists not directly linked to the
specific song are not included.
If a song has a lyrics and the user is scrolling through them, if the
user doesn't scroll for 5 seconds, the focus leaves the lyrics and they
scroll to the current line if available.
Dev note: Both backdrop & lyric updates are refactored to use `Flow`s to
trigger lookups
### Related issues
Fixes#1170
### Testing
Emulator, I need to test it longer term
## Screenshots
N/A
## AI or LLM usage
None
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