- Added previous chapter button (matching next button style)
- Made progress bar interactive - now occupies full background of mini player
- Horizontal drag/tap on progress bar seeks audio (shows amber overlay while seeking)
- Progress bar now uses full pill shape as background instead of small bottom border
- Tightened button spacing (12pt instead of 16pt) to fit prev/next buttons
- Changed vertical drag to simultaneousGesture to not conflict with horizontal seek
- Buttons slightly smaller (40pt) to accommodate prev button in layout
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