pr: https://git.cafe/pingdotgg/t3code/pulls/25874
main: b50d8a1b15eed3a75e1e0969765e14c6436d80d7
original head: f1208084e7ba651cd0d9f6808998f531c5a4d1be
fixed head: aa88db3bf1ba4caf59e77a69981b04e334bd5955

runtime: isolated dev homes, one background dev server at a time.
client: repo playwright 1.60.0, /usr/bin/google-chrome, 1440x1000.
real git projects and codex gpt-6.1-sol turns created through the web app.
browser preferences saved with the app's updateClientSettings persistence API;
web settings disables these desktop-only controls.

main, saved light/80%, address-bar opening Wikipedia:
  snapshot omitted colorScheme and zoomFactor; menu system/100%.
original PR, same settings and page:
  snapshot light/0.8; menu light/80%; real page innerWidth=539, devicePixelRatio=2.
fixed PR, same settings and page, real codex preview_evaluate:
  innerWidth=674; devicePixelRatio=1.600000023841858;
  matchMedia('(prefers-color-scheme: light)').matches=true.

per-tab controls changed dark/100%; close and ctrl+shift+t reopened dark/100%.
changed defaults light/125%; clicked actual markdown link from codex response.
new tab opened light/125%; existing dark/100% tab retained its override.
real codex preview_evaluate on exact current tab IDs after client viewport resize:
  older reopened tab: innerWidth=539, devicePixelRatio=2, prefers-light=false.
  new chat-link tab: innerWidth=431, devicePixelRatio=2.5, prefers-light=true.

blacksmith-check: 55 focused tests passed (5 files, including ServerBrowser).
blacksmith-check: vp run check:changed 48a292364ab37574c67fb377b5227e5d281d9203
  passed format, lint, graphql, knip, 32-package typechecks, 61 tests in 8 files.
explicit PR-base argument used because runner snapshot history is shallow.
two independent read-only reviewers approved aa88db3.