Make the banner check run in CI and match the current card

[cezaraugusto]

test:banner never ran in CI. build-and-lint restored node_modules but not the Playwright browser cache, so the script found no Chromium, printed a skip and exited 0 on every run

it also could not pass anywhere it did run. since Extension.js 4.1.0 the dev card keeps three rows and Profile ranks above Extension ID, so the line the check waited for is never printed. the skip hid that

the check now reads extensionId from ready.json and requires the exact id Chromium derives from the fixture manifest key, which proves the browser loaded this manifest. it waits for the real Browser Chromium card row, matched case-sensitively, because the old pattern was also satisfied by the echoed --browser chromium argument. dev runs with EXTENSION_HEADLESS=1 so no display is needed and no window steals focus

a missing Chromium now fails the step under CI and skips with an install hint locally. build-and-lint restores the Playwright cache with the same key dev-reload-chromium uses

locally the check passes in about 8s (it timed out at 96s before), and fails as expected with a wrong expected id and with a missing binary under CI=true