Add deterministic captures 14-21 for the remaining screen-design states, fix the panel/button layout issues they exposed, and record 21/21 compare and judge results. Bump the source to 0.9.3 and move the completed milestone to DONE.md.
Screenshots
Committed gallery captures generated from the current build by src/test/capture_screenshots.gd, src/test/capture_ui_states.gd and src/test/capture_prop_gallery.gd.




















