feat(web): subtle hover/tap video controls (seek + play/pause)
Add a discreet bottom control bar to the hero video — play/pause, elapsed
time, a seek slider, and mute — that reveals on hover (desktop) or tap
(touch) and auto-hides ~2.8s after the last interaction while playing; it
stays visible while paused so the scrubber is reachable. The seek slider is
a real <input type=range> (keyboard/drag/touch, accessible) laid invisibly
over a custom rail+fill so the look matches the page. Autoplay/muted/loop,
the centre play overlay, the play-failed fallback link and poster are
unchanged; the always-on mute button is now folded into the bar.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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