fix(player): count a play on real listening, not on metadata load

[EnesYilmazcode]

Fixes #8.

Problem

playCount was bumped in onLoadedMetadata, which fires as soon as metadata decodes — before playback, and even if play() is rejected. So skipping through tracks counted a play for each, and the count was credited to current, which may already have changed after a rapid switch (wrong-track attribution).

Fix

• Count in onTimeUpdate once playback passes a threshold: 5s, or halfway through a shorter track.
• Credit loadedIdRef — the id the <audio> element is actually loaded with — not the render-closure current.
• loadedIdRef is blanked at the start of each load and set only when the element switches to the new track, so a timeupdate from the still-playing previous track during the async blob read can't double-count it.

Verification

Built clean; behavioral test reading real playCount deltas:

Action	playCount delta
Play "Last Stop", skip away at 0.5s	0 (not counted) ✅
Play "Express Track" past threshold	+1 (counted once) ✅
page errors	none ✅

Note: loop-all re-loads the track each wrap so it counts per repeat (each full play = a play, like most players); loop-one uses native audio.loop and counts once — an inherent, acceptable difference.

🤖 Generated with Claude Code

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Generated by Claude Code