[davior]

What

A follow-up to #31. In the Sound picker, when a hit has a moment, the waveform preview now marks it.

Which hits have a moment:

• the spoken line a search matched (start_time/end_time, sized by the existing momentTrim);
• otherwise a GAM clip's own in_point/out_point, which line up with the waveform because a clip plays its parent's file.

What changes for such a hit:

• Everything outside the moment is dimmed, and the moment itself is tinted.
• The player opens at the moment's start.
• The readout says which stretch it is: 2:00 long · matched at 0:11–0:18, or … · clip of 0:10–0:25.

This is display only: "Use this track" still uses the whole file.

How

• WaveformPlayer takes an optional moment.
  • The shading sits at z-10 over wavesurfer's own layers, which stack at z-index 2 and 5. This is the same fix GAM's clip window needed.
  • The tint behind the bars is there because, in dark mode, dimmed gray bars and plain ones looked almost the same.
• The seek happens on loadedmetadata, because a seek made before the browser knows the duration is silently ignored.
• The picker keys the player on the moment, so two hits on one file each reopen at their own moment, as the video preview already does with trim.

Testing

• npm test: 204 passed. The new tests cover:
  • the shade widths and the opening seek;
  • no shading without a moment;
  • the picker showing a matched line, a GAM clip's window, and nothing for a name-only hit.
• lint, Prettier and build are clean.
• Driven in Chromium against GAM on :8001 and GVC on :8002/:5175. Picking "Clip of varied (0:10–0:25)":
  • the shading covers 0–25% and 62.5–100% of the waveform;
  • the player opens at 10 s;
  • the readout says 0:15 long · clip of 0:10–0:25;
  • it is legible in light and dark.

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