A `.figcraft` image member that is damaged, too large or missing was skipped
without a word, and saving the file again dropped it for good. The load now
lists each lost image (up to 20, then a count) with its hash and the reason,
file.open puts it in `repairs` and sets a session message, and the app shows
that as a toast.
Co-authored-by: Claude Sonnet 5.5 <noreply@anthropic.com>
Co-authored-by: bflatastic <bombayapirat@gmail.com>
