The public share page only rendered media previews for FOLDER shares —
a single-file share got a bare icon + download button, even for images
and videos the browser can play natively.
Backend: resolve the shared file's mime_type + size at read time and
expose them on ShareDto (meta + password-verify endpoints, one shared
enrichment helper). Display-only enrichment: a failed file lookup
leaves the fields None instead of failing the response — the download
endpoint still surfaces the real error.
Frontend: the 'file' view now reuses the folder grid's lazyVideo
(poster-seek + retry) for video and imageRetry for images, with
Range-aware streaming already provided by /api/s/{token}/file/{id}.
Co-Authored-By: Claude Code <noreply@anthropic.com>
cjw
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