Pure function returning /api/documents/{id}/thumbnail?v=<timestamp>
or null when thumbnailKey is missing. The encoded timestamp changes
whenever the backend regenerates a thumbnail (file replace),
invalidating browser caches despite the immutable Cache-Control.
Refs #307
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
1.1 KiB
1.1 KiB