fix(mcp): anchor aria-ref regex in target resolution

[yury-s]

Summary

• Anchor the aria-ref detection regex so locators like id=z2l9e43l3 (which contain e\d+ substrings) are no longer misclassified as aria-refs.

Fixes microsoft/playwright-mcp#1600

[github-actions]

Test results for "MCP"

8 failed
❌ [firefox] › mcp/cli-drag.spec.ts:53 › drop files and data onto an element @mcp-windows-latest-firefox
❌ [firefox] › mcp/cli-isolated.spec.ts:21 › should not save user data by default (in-memory mode) @mcp-windows-latest-firefox
❌ [firefox] › mcp/cli-json.spec.ts:75 › open returns envelope with session, pid and snapshot file @mcp-windows-latest-firefox
❌ [firefox] › mcp/cli-json.spec.ts:84 › list after open returns one browser entry @mcp-windows-latest-firefox
❌ [firefox] › mcp/cli-json.spec.ts:103 › goto returns snapshot file envelope @mcp-windows-latest-firefox
❌ [firefox] › mcp/cli-json.spec.ts:109 › eval returns result string @mcp-windows-latest-firefox
❌ [firefox] › mcp/http.spec.ts:103 › http transport browser lifecycle (isolated) @mcp-windows-latest-firefox
❌ [firefox] › mcp/http.spec.ts:142 › http transport browser sigint @mcp-windows-latest-firefox

6881 passed, 1015 skipped

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Merge workflow run.

[github-actions]

Test results for "tests 1"

4 flaky

⚠️ [chromium-library] › library/video.spec.ts:647 › screencast › should capture full viewport `@chromium-ubuntu-22.04-node24`
⚠️ [chromium-library] › library/video.spec.ts:682 › screencast › should capture full viewport on hidpi `@chromium-ubuntu-22.04-node24`
⚠️ [chromium-library] › library/video.spec.ts:719 › screencast › should work with video+trace `@chromium-ubuntu-22.04-node24`
⚠️ [chromium-library] › library/video.spec.ts:647 › screencast › should capture full viewport `@chromium-ubuntu-22.04-node22`

41577 passed, 847 skipped

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Merge workflow run.