FX.38 MarkupCraft: copy and paste a selection of markups, and save it as a stamp or tool

Reported 2026-10-26 (0.7): selecting markup content has no way to copy and paste the selection, or turn it into a stamp or tool-chest tool. Check against the current build first (D8.15 Copy area copies a page region, a different thing). Untested.

Checked 2026-11-05 by markup-fix-09: already built in 0.7.1 (71.6 copy/paste, 71.9 Save as a stamp) and in the released 0.8.1. The reporter wrote on 0.7. Copy/paste of markups and of page content works on the same page, other page and other open file (and other tab); Save selection as a stamp puts markups, pictures included, into the tool chest. Tested: tools/markupcraft-test/browser-071.mjs 39/0 in a real browser, bin/test-markupcraft.mjs 565/0 (new check: a picture stamp survives the chest file). Help: stamps-and-notes, tool-chest. Reporter's own build and wording not confirmed.