fix(player): restart on re-tap + kill loop-all Now Playing flicker

[EnesYilmazcode]

Fixes #9. Fixes #14.

Problem

The load effect was keyed on [index, current?.id], so:

• Re-selecting the track already playing (same index) never reloaded — tapping a finished/playing track did nothing instead of restarting.
• next()/prev() on a single-track loop-all queue hit the same dead end.
• The loop-all wrap used setIndex(-1) + requestAnimationFrame(() => setIndex(0)), which made current null for a frame and flashed the Now Playing screen closed (losing lyrics scroll) every cycle.

Fix

Add a playToken nonce to the load effect's deps, bumped whenever a restart is intended:

• playQueue bumps it → re-tapping the current track restarts it.
• next()/prev() bump it (instead of a no-op setIndex) when the target index equals the current one (single-track loop-all). They now read index from the render closure so that case is detectable.
• onEnded's loop-all wrap sets index 0 and bumps the token instead of the setIndex(-1) bounce — current never becomes null, so no more flicker.

Verification

Built clean; behavioral test:

Check	Result
Play → seek to 5s → re-tap same track → currentTime	0.64 (restarted) ✅
Switch to a different track	plays, metadata "Express Track" ✅
page errors	none ✅

The flicker fix is verified by construction (the setIndex(-1) null-frame is gone); the single-track loop-all + on-device Now Playing behavior are best confirmed on your phone.

🤖 Generated with Claude Code

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Generated by Claude Code