chore: cache Playwright browser install

[teemingc]

Restoring the install from cache seems to save 5-10 seconds. Solution adapted from the article Rich shared https://endform.dev/blog/playwright-github-actions#speed-fix-1-cache-the-browser-binaries . OS-specific cache paths taken from https://playwright.dev/docs/browsers#managing-browser-binaries

Cache is keyed to pnpm-lock.yaml so it will bust when we upgrade deps. We could derive the playwright version from the pnpm workspace file...

[pkg-svelte-dev]

Install the latest version of @sveltejs/kit from 4946439:

pnpm add https://pkg.svelte.dev/@sveltejs/kit/c/49464397e55cf9cfedd559a6511aebd80bed4a19

Open in pkg.svelte.dev: https://pkg.svelte.dev/repos/kit/pr/16387

[changeset-bot]

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Latest commit: 4946439

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