# 2026-03-31 - YouTube Music Playback Phase 3 Implementation

## Summary

Phase 3 focused on playback controls and now-playing UX improvements.

Implemented:
- pause and resume controls
- next-track preview in the now-playing message
- immediate control message refresh after queue and button actions

## Changes

### 1. Pause / Resume

- Added `/music pause`
- Added `/music resume`
- Added pause/resume control button toggle in the playback message
- Paused playback now freezes progress updates and resume restarts them

### 2. Next Track Preview

- The now-playing embed now shows the next queued track when one exists
- Queue length and next-track display are refreshed when tracks are added or removed

### 3. Immediate UI Refresh

- Button actions now use deferred updates and refresh the control message immediately
- Stop and leave actions move the playback message to the idle state without waiting for the periodic updater
- Queue mutations such as `add` and `remove` also refresh the control message

## Files

- `src/commands/music.ts`
- `src/services/MusicService.ts`
- `src/i18n/types.ts`
- `src/i18n/locales/en.ts`
- `src/i18n/locales/ko.ts`

## Validation

- `yarn build`
- `yarn test --runInBand`

Both commands completed successfully.
