fix: address lint CI failures

[chenjiahan]

Summary

This PR fixes the current main lint CI failures after the rslint upgrade with a minimal diff. It keeps the existing ANSI regex implementation and adds localized no-control-regex disables for those literals, removes the redundant boolean cast around the codePointAt capability check, and uses Object.prototype.hasOwnProperty.call for color overrides.

Related Links

• fix: address main CI failures #234

[coderabbitai]

📝 Walkthrough

Walkthrough

Two client-side utility files receive defensive coding corrections. In overlay.ts, the getCodePoint function's availability check for String.prototype.codePointAt is changed from boolean coercion (!!) to an explicit typeof ... === 'function' comparison. In client-src/utils/ansiHTML.ts, ESC and CSI character-code constants are introduced and used to construct the _regANSI regex via new RegExp(...) instead of a hardcoded literal; a new global _regANSIColors constant is added and used in the SGR text.replace call; and setColors switches from colors.hasOwnProperty(key) to Object.prototype.hasOwnProperty.call(colors, key).

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'fix: address lint CI failures' directly describes the primary objective of the PR, which is to fix lint CI failures mentioned in the description and PR objectives.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	The PR description clearly relates to the changeset, describing specific fixes for lint CI failures including ANSI regex handling, codePointAt check optimization, and hasOwnProperty usage updates.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chenjiahan/fix-main-lint-ci

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