Switch the preview overlay from a still <img> to a <video> tag when the
focused photo's Type is "video". Uses PhotoPrism's /api/v1/videos/:hash
endpoint with the existing previewToken, falls back to a still thumb as
the poster, and autoplays muted so the controls reveal without
clobbering whatever else is on the page.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Replace the legacy mule-image backend with PhotoPrism plus a thin
SvelteKit client and a Node sidecar for endpoints PhotoPrism doesn't
expose (file rename), and add a two-phase migrator (metadata via PUT,
heaps → albums) for the existing Postgres library.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
