chore(debug controller): add per-browser highlight + close

[Skn0tt]

My UI will have per-browser buttons for picking a locator and closing a browser.

[github-actions]

Test results for "tests 1"

2 failed
❌ [playwright-test] › runner.spec.ts:118 › should ignore subprocess creation error because of SIGINT @macos-latest-node18-1
❌ [webkit-page] › page/page-navigation.spec.ts:28 › should work with cross-process _blank target @webkit-ubuntu-22.04-node18

19 flaky

⚠️ [chromium-library] › library/debug-controller.spec.ts:389 › should work with browser._launchServer `@chromium-ubuntu-22.04-node18`
⚠️ [chromium-library] › library/page-clock.frozen.spec.ts:19 › clock should be frozen `@chromium-ubuntu-22.04-node18`
⚠️ [chromium-library] › library/debug-controller.spec.ts:389 › should work with browser._launchServer `@chromium-ubuntu-22.04-node20`
⚠️ [chromium-library] › library/page-clock.frozen.spec.ts:19 › clock should be frozen `@chromium-ubuntu-22.04-node20`
⚠️ [chromium-library] › library/debug-controller.spec.ts:389 › should work with browser._launchServer `@chromium-ubuntu-22.04-node22`
⚠️ [chromium-library] › library/page-clock.frozen.spec.ts:19 › clock should be frozen `@chromium-ubuntu-22.04-node22`
⚠️ [chromium-library] › library/debug-controller.spec.ts:389 › should work with browser._launchServer `@chromium-ubuntu-22.04-node24`
⚠️ [chromium-library] › library/page-clock.frozen.spec.ts:19 › clock should be frozen `@chromium-ubuntu-22.04-node24`
⚠️ [firefox-library] › library/browsercontext-reuse.spec.ts:114 › reuse connect › should reset serviceworker `@firefox-ubuntu-22.04-node18`
⚠️ [firefox-library] › library/inspector/cli-codegen-1.spec.ts:1079 › cli codegen › should not throw csp directive violation errors `@firefox-ubuntu-22.04-node18`
⚠️ [firefox-library] › library/inspector/cli-codegen-aria.spec.ts:23 › should generate aria snapshot `@firefox-ubuntu-22.04-node18`
⚠️ [firefox-page] › page/page-emulate-media.spec.ts:144 › should keep reduced motion and color emulation after reload `@firefox-ubuntu-22.04-node18`
⚠️ [chromium-library] › library/debug-controller.spec.ts:389 › should work with browser._launchServer `@ubuntu-22.04-chromium-tip-of-tree`
⚠️ [chromium-library] › library/inspector/console-api.spec.ts:38 › should support playwright.$, playwright.$$ `@ubuntu-22.04-chromium-tip-of-tree`
⚠️ [webkit-library] › library/browsercontext-basic.spec.ts:190 › should not report frameless pages on error `@webkit-ubuntu-22.04-node18`
⚠️ [webkit-library] › library/debug-controller.spec.ts:389 › should work with browser._launchServer `@webkit-ubuntu-22.04-node18`
⚠️ [webkit-library] › library/debug-controller.spec.ts:418 › should support closing browsers `@webkit-ubuntu-22.04-node18`
⚠️ [webkit-library] › library/inspector/cli-codegen-2.spec.ts:24 › cli codegen › should contain open page `@webkit-ubuntu-22.04-node18`
⚠️ [webkit-page] › page/page-navigation.spec.ts:20 › should work with _blank target `@webkit-ubuntu-22.04-node18`

46612 passed, 801 skipped

---

Merge workflow run.