Controls bar added to playlist sidebar header with:
- Prev/Next skip buttons (disabled when at bounds)
- Shuffle toggle (Fisher-Yates order stored in localStorage)
- Loop 3-state: off → loop all → loop one
- Autoplay toggle (default on, persists per playlist in localStorage)
All state is instant — no page reload on toggle.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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