Fix wrong variable name and path in README.invariant.md "Documenting Complete Mapping" example

[ooloth]

What

• Corrects emojiLabels[symbol] to emojiLabel[symbol] in the "Documenting Complete Mapping" code block — the real variable is singular, no trailing s
• Corrects the path comment from ui/emoji.tsx to ui/elements/emoji.tsx to match the actual file location

Why

• A reader copying the example snippet would get a reference error since emojiLabels does not exist in the codebase

How to validate

• Open utils/errors/README.invariant.md and read the "Documenting Complete Mapping" block — expect emojiLabel[symbol] (singular) and path comment // ui/elements/emoji.tsx
• Open ui/elements/emoji.tsx — expect const emojiLabel on line 3 and emojiLabel[symbol] on line 30, matching the example

Closes #31

Related links

• Fix wrong variable name in README.invariant.md "Documenting Complete Mapping" example #31
• https://claude.ai/code/session_01Ajyob6XtCXqtQ87VKqXQrL

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Generated by Claude Code

[claude]

Code Review

Overview

This PR fixes two typos/inaccuracies in a documentation code example inside utils/errors/README.invariant.md:

1. Variable name typo: emojiLabels[symbol] → emojiLabel[symbol] (removes erroneous trailing s)
2. Incorrect file path comment: // ui/emoji.tsx → // ui/elements/emoji.tsx

Both corrections are verified against the actual codebase in the PR description's validation checklist.

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Code Quality and Style

• The change is minimal and targeted — exactly what's needed, nothing more.
• Markdown formatting and surrounding context are untouched.
• The PR description is thorough and includes a concrete validation checklist, which is good practice for doc-only changes.

Correctness

• The fix addresses a real issue: a reader copying the snippet would hit a ReferenceError at runtime since emojiLabels doesn't exist — the actual variable is the singular emojiLabel. This is a meaningful correctness fix, not just cosmetic.
• The path correction (ui/elements/emoji.tsx) matches where the file actually lives, making the example navigable.

Potential Issues

None. The change is documentation-only with no runtime impact.

Suggestions

No changes needed. The fix is accurate and complete.

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Verdict: LGTM. Small, correct, and well-described. Ready to merge.

[Copilot]

Pull request overview

This PR fixes a documentation example in utils/errors/README.invariant.md so it matches the actual emoji mapping implementation used by the UI, preventing copy/paste errors from the README.

Changes:

• Corrects the example variable from emojiLabels to emojiLabel to match the real identifier.
• Updates the referenced file path in the example comment to ui/elements/emoji.tsx.

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