* test(mobile-web): act on the HTML preview frame only once the browser routes input into it
Chromium runs the sandboxed preview frame in its own process. The rig decided an arm was
ready once the artifact had parsed, but the embedder can still be showing the frame's white
before its surface is composited, and still keep pointer input over the frame for itself
until it holds the frame's hit-test region. A click in that window landed on the
embedder's <iframe>, Playwright reported success, and the arm waited for a navigation
that never came (or read white as pixelBefore).
The rig now waits for the artifact's paint before reading pixelBefore, and before acting
moves the pointer over the frame until the embedder stops receiving it.
* test(mobile-web): name the arm in the input-routing timeout and trim history comments
Neil
9f040bcb8b