test(web): cancel queued animation frames during worker cleanup

[saphid]

The editable-file language test can leave a worker statistics animation frame queued after teardown removes the browser globals. CI then reports an uncaught cancelAnimationFrame is not defined error even when every assertion passes.

Track the test-owned animation frame handles and cancel the remaining callbacks after worker termination and highlighter disposal, before restoring globals. Production behavior is unchanged. This is a prerequisite for #10051. It includes the existing test-only retention correction from #10865 because the current V2 base otherwise fails that server assertion; merge #10865 first. The incremental cleanup remains one web test file.

Verification: all 7 tests in fileEditorLanguageReadiness.test.ts passed with the fix; focused lint and formatting passed. The identical patch was tested in the #10051 composition. A recent direct claude -p --model claude-opus-5 --effort high --tools '' --output-format json review attempt exited 1 because OAuth had expired, before inference; independent review was unavailable.

Model: GPT-6 Astra. Harness: Codex (T3 Code).

[macroscopeapp]

Approvability

Verdict: Approved at 52c3fcb

Macroscope's review found this PR approvable — Both changed files are isolated test code: one updates a retention assertion, and the other cleans up mocked animation-frame callbacks during teardown. No production behavior, product defaults, or static-analysis configuration is changed.

Notes:

• No code objects were reviewed. Approvability was decided on eligibility alone.

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Dismissing prior approval to re-evaluate 52c3fcb