The v2 equivalents of main's #8984 and #8922: a "Working for ..." header
anchors the active run, the trailing live tool row survives between
actions in past tense instead of vanishing, and a shimmering Thinking
row marks reasoning gaps. During workspace preparation the header shows
"Setting up worktree..." (driven by the local dispatch flag or the v2
run's preparing status, so remote viewers see it too), the composer
footer span is gone, and draft promotion waits until the run starts or
startup fails instead of navigating mid-preparation.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>