photo.reload decoded every targeted file on the UI thread, so a selection
of raws froze the window until all were read. The command is now split into
plan / probe / apply (engine `cmd::reload`); the app intercepts photo.reload
and probes the files on a worker thread with a cancellable activity row
(kind `reload`, counted progress), applying the result as one undo step.
`wait: true` keeps the old in-place behaviour for agents; CLI/MCP unchanged.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
