bug: 🐛 fix skin tone emoji reaction mapping

[clins1994]

Please merge #179 then update this with latest changes before reviewing

Summary

• Strip Unicode skin tone modifiers when normalizing Matrix reaction keys
• Reuse the existing base emoji LINE reaction mappings for skin tone variants

Fixes #176

Testing

• go test ./pkg/connector

[coderabbitai]

📝 Walkthrough

Walkthrough

The normalizeMatrixReactionKey function in the reaction handler now filters out Unicode skin-tone modifier runes during normalization. Emoji reactions that differ only by skin-tone variants (U+1F3FB–U+1F3FF) are now treated as equivalent for LINE emoji mapping lookup.

Changes

Emoji Skin-Tone Modifier Normalization

Layer / File(s)	Summary
Skin-tone modifier stripping in reaction normalization pkg/connector/reaction.go	The rune-filtering step in normalizeMatrixReactionKey now removes skin-tone modifier code points by mapping them to -1, before applying the existing variation-selector filtering and key-reduction logic.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~5 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% 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
Linked Issues check	✅ Passed	The code changes directly address issue #176 by stripping Unicode skin tone modifiers during normalization so variants map to base emoji LINE reactions.
Out of Scope Changes check	✅ Passed	All changes are scoped to normalizing skin tone modifiers in reaction key mapping, with no unrelated modifications outside the stated objective.
Title check	✅ Passed	The title clearly and specifically describes the main change: fixing skin tone emoji reaction mapping by stripping Unicode modifiers. It is concise, relevant to the changeset, and accurately reflects the primary objective addressed in the PR.
Description check	✅ Passed	The pull request description clearly relates to the changeset, outlining the specific feature being implemented and referencing the issue it addresses.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}