Backend:
- get_thumbnail: for non-images, serve cached thumb or 204 (not 400)
- store_external_thumbnail: validate + re-encode to WebP + persist
- get_cached_thumbnail: memory → disk lookup without generation
- PUT /api/files/{id}/thumbnail/{size} endpoint for client uploads
- ThumbnailPort trait: add get_cached_thumbnail + store_external_thumbnail
Frontend (photos.js):
- On <img> error for video tiles, use <video> + <canvas> to extract
a frame at 25% duration using browser's native codec
- Show frame immediately via blob URL
- Fire-and-forget PUT to server for permanent caching
- Subsequent visits serve cached WebP instantly (no re-extraction)
Zero server-side dependencies — CPU distributed across clients.
Diocrafts
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