On Debian/Ubuntu outside GitHub Actions, `tools/playwright.sh` always
ran `pnpm exec playwright install --with-deps`. Installing system
packages needs root: when it isn't root, Playwright tries `sudo` and
falls back to `su`, so a non-root user without passwordless sudo sees
`make playwright` — and the targets depending on it, `make test-e2e` and
`make test-frontend` — either stop and ask for the root password
mid-build or fail outright with `su: System error`.
Related: #38860, which added this script.
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Co-authored-by: silverwind <me@silverwind.io>
Run them in headless [vitest browser
mode](https://vitest.dev/guide/browser/) in chromium and firefox.
Similar UX than current tests, it's about 5 times as slow (goes from 1s
to 5s on my machine), but definitely worth it as it removes all
happy-dom problems.
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Signed-off-by: silverwind <me@silverwind.io>
