### Description Restore legacy manual Next behavior in the Media3 playback service. This PR advertises the standard Media3 NEXT command and routes it through the Media3 next-in-queue path with legacy-equivalent playback finalization. That restores legacy queue cleanup, episode played-state handling, playback history, auto-delete evaluation, and end-of-queue behavior for manual Next. While implementing this, several related Media3 playback synchronization issues were also addressed: - Route playback state synchronization through `updatePlaybackPreferences()` after switching episodes so `PlayerStatusEvent` is emitted through the centralized helper and the playback UI immediately reflects the new media. - Clear the current playable when skipping the final queue item so the service, player, widget, and notification do not retain stale playback state. - Restore the existing end-of-queue message when manually skipping the final queued episode. - Use Media3 media button preferences instead of the legacy custom layout API so the standard NEXT command can be exposed while preserving the intended notification/SystemUI button arrangement. Closes #8528 ### Checklist - [x] I have read the contribution guidelines: https://github.com/AntennaPod/AntennaPod/blob/develop/CONTRIBUTING.md#submit-a-pull-request - [x] I have performed a self-review of my code, going through my changes line by line and carefully considering why this line change is necessary - [x] I have run the automated code checks using `./gradlew checkstyle lint` - [x] My code follows the style guidelines of the AntennaPod project: https://antennapod.org/contribute/develop/app/code-style - [x] I have mentioned the corresponding issue and the relevant keyword (e.g., "Closes: #xy") in the description (see https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue) - [ ] If it is a core feature, I have added automated tests
AntennaPod
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