Previously, prev/next buttons were relative to the currently playing
chapter and only worked for one navigation step. They relied on
audioPlayer.prevChapter and audioPlayer.nextChapter which were set
when loading audio and never updated.
Now buttons use absolute chapter navigation:
- Previous: always navigate to (current chapter - 1)
- Next: always navigate to (current chapter + 1)
- Bounded by chapter 1 and max chapter number
- Works continuously without stopping after one navigation
Added AudioPlayerService.absolutePrevChapter and .absoluteNextChapter
computed properties that calculate the prev/next chapter numbers based
on the current chapter and total chapters list.
Updated both mini player and full player to use absolute navigation.
e43699747d