The sidebar player was a poor use of vertical real estate and created the
collapsed-state layout issues. The mini player is now a fixed 360px widget
at bottom-right (above the bell/help buttons), matching the convention of
most streaming apps.
Changes:
- Removed media player from sidebar; sidebar spacer now pushes support/version
section to bottom as before
- New .mini-player-body horizontal layout: album art | track info | controls
- Added prev/next skip buttons (mini-nav-btn) with same skip logic as the
Now Playing modal; updateNpPrevNextButtons() now syncs both sets
- .media-player.idle now display:none (widget hides entirely when no track)
- Progress bar is a flush full-width line at the top of the widget
- Volume slider kept as hidden DOM element for JS compatibility; volume is
set via the Now Playing modal
- Toast container moved up to bottom:174px to stay above the mini player
- expand-hint button updated to four-corner expand icon, opens NP modal
- All volumeSlider and click-exclusion references updated for null-safety
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