Single-asset public share: HLS video fails to play in Firefox (no hls.js fallback) #68

Reported by @ducknoodledance in #62. Firefox on Linux shows
"No video with supported format and mime type found"; Brave plays.
Project / folder share viewers are unaffected.

Root cause

The single-asset share page uses a bare <video> element:

apps/web/app/share/[token]/page.tsx:478-485

<video src={streamUrl} controls className="..." preload="metadata">
  Your browser does not support video playback.
</video>

Since the HLS proxy fixes (ad3907ad, bfbbcee2), streamUrl for
videos resolves to …/master.m3u8. Firefox and Chrome on Linux have
no native HLS support, so the element fails. The folder-share viewer
already handles this correctly with an hls.js dynamic import +
canPlayType('application/vnd.apple.mpegurl') Safari fallback
(apps/web/components/share/folder-share-viewer.tsx:674-686); the
single-asset share page was never updated.

Proposed fix

Replace the bare <video> on the single-asset share page with the
same HLS-aware player used by the folder share viewer (extract a
shared <HLSVideo> component so both paths use it).