fix(lint): exclude playwright-report/ and test-results/ from eslint

[ericgozzi]

Summary

• `eslint.config.js`'s top-level `ignores` list didn't mirror `.gitignore`'s `playwright-report/` and `test-results/` entries.
• Once either directory exists locally (e.g. after running `npm run test:browser`), `npm run lint` - and therefore `npm run check` - picks up ~4000 errors from Playwright's bundled/minified vendor JS inside the report.
• Unrelated to the in-flight toolbar-schema work; found while investigating a report of `npm run check` failing with thousands of errors.

Test plan

• Reproduced: with a local `playwright-report/` present, `npx eslint .` failed with ~3981 errors before this fix.
• `npx eslint . --max-warnings=0` passes clean after the fix, with the same `playwright-report/` still present.