The background-worker pipeline drains in under a second on a fast machine,
making it impossible to screenshot live. This adds a dev-only panel
(Ctrl+Shift+D) that injects a frozen mid-pipeline state into mediaJobProgress
so the worker bar can be captured at leisure, then cleared. Gated by
import.meta.env.DEV and verified absent from the production bundle, so it
never ships. A first rough cut of the broader screenshot/demo mode.
LyAhn
e4373195fe