Player.tsx updates:
- Repeat button: ISO repeat indefinitely icon with glowing toggle state.
When active: lyria-accent color, bg-lyria-accent/10, orange glow shadow.
When inactive: muted gray, hover to white. Toggles audio.loop.
- Skip to beginning: Now uses ISO skip-backwards icon (filled, two bars
pointing left) instead of circular arrow. Title: 'Skip to beginning'.
- Track end handler respects repeat state — if repeating, stays playing
and loops; if not, pauses as before.
- New state: isRepeating (useState), toggleRepeat function sets both
React state and audioRef.current.loop.
