The Studio furniture pane was present in the DOM the whole time and still
looked empty. Every row existed, had real dimensions, and its image loaded
with a 200 — and none of it was visible.
The pane was wrapped in a `motion/react-m` element declared with
`initial={{ opacity: 0 }}` and `animate={{ opacity: 1 }}`. That minimal entry
renders the element but never runs the animation, so the inline style stayed at
opacity 0 and the content was painted transparently forever. Measured on the
live release: the table sat at opacity 1 directly inside a wrapper pinned at
`style="opacity: 0"`.
It went unnoticed because playwright.ui.config.ts sets reducedMotion to
"reduce", under which the animation is skipped and the element lands straight
on its final value. The existing Studio specs therefore passed while the real
browser showed nothing. That also means the perf win from the minimal entry
was never actually delivering a working fade — it only hid the breakage.
The decorative 150ms fade is now a CSS animation (.studio-list-fade-in). A CSS
animation cannot strand content this way: if it never runs, the element is
simply opaque. motion/react-m had exactly one usage in the app and is gone;
the four files that use the full motion/react are untouched and unaffected.
Adds e2e/ui/studio-visibility.spec.ts, which opts out of reduced motion and
asserts no ancestor of a furniture row is faded below 0.9. Verified it fails
on the old code with `Received: 0` and passes on the new, so this cannot
regress silently again.
