As a bare rugnux forgets the crystal an input file stores (ClearStoredCrystal), the settings panel
now shows the file's cell and space group but does not use them until the user ticks "Known unit
cell". Before, a file carrying a cell was indexed and merged with it, like rugnux -C/-S.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>