A raw imported while its format couldn't be decoded kept preview_only until a
manual Reload, so new decoders in a release never reached existing photos.
When a library opens in another app version, its preview-only photos whose
stamp differs are probed again in the background and get exactly what Reload
from Disk gives them (shared reload_ops): a file that decodes now loses the
flag, one that still doesn't gets the current reason and a fresh stamp. The
result is one journaled system batch, not an undo step; develop settings and
history are kept. Unreadable files are left for next time, photos changed
while probing are skipped, and a result for a library closed meanwhile is
dropped. A toast says how many raws now develop from their raw data.
- engine: cmd/recheck.rs (stale / probe / apply) and
library.recheckPreviewOnly {all?} -> {checked, updated, cleared}; refused
without file access, where every probe would clear every flag
- desktop: recheck::tick once per library generation, through tasks::spawn
("Checking raw files" in the activity stack)
- the preview-only notice (Edit, Info) gains a Reload from Disk button
- strings translated in all nine catalogs; docs/mcp.md and the parity row
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>