- Add with-button-feedback helper that shows loading/success/error states
- Button pulses while request is in-flight, flashes green on success, red on error
- Button is disabled during request to prevent double-clicks
- Migrate show-toast from inline styles to CSS class (toast-notification)
- Add LASS styles: btn-loading, btn-success-flash, btn-error-flash, keyframe animations
- Wrap all admin controls: liquidsoap (refresh/skip/reload/restart), icecast restart,
queue (save/save-as/clear), playlist (load), scheduler (refresh/enable/disable/load)
- No inline CSS or JS added - all styles in asteroid.lass, all logic in ParenScript
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