fix(web): handle emoji variation selectors in tag parsing

[gitkeniwo]

This PR closes #5495 and fixes frontend tag parsing to keep emoji sequences that include Variation Selector-16 (\p{M}) and Zero Width Joiner (\u200D).

The test case is

#🤔/🤔 #🤔/text #🀄️/text #🀄️/🀄️ #🀄️test/🀄️ #test🀄️test/🀄️

Summary by CodeRabbit

• Improvements
  • Enhanced tag character support to recognize Unicode combining marks and special formatting characters, enabling more flexible and diverse tag naming conventions.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 3f51f2ab-3fd0-421d-9f3f-cba17bc92d0c

📥 Commits

Reviewing files that changed from the base of the PR and between 6a03917 and 2d1de0f.

📒 Files selected for processing (1)

• web/src/utils/remark-plugins/remark-tag.ts

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📝 Walkthrough

Walkthrough

The change extends tag-character validation in the remark tag parser to recognize Unicode combining marks and the zero-width joiner character as valid tag components, enabling proper parsing of emojis with variation selectors in tag names.

Changes

Cohort / File(s)	Summary
Tag Character Validation web/src/utils/remark-plugins/remark-tag.ts	Extended isTagChar to accept Unicode combining marks (\p{M}) and zero-width joiner (\u200D) as valid tag characters, fixing parsing of emojis with variation selectors.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Poem

🐰 A hop, skip, and emoji bound,
Where variation selectors hide without a sound,
Unicode marks now stand tall,
In tags they'll parse through it all! ✨

🚥 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
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'fix(web): handle emoji variation selectors in tag parsing' directly addresses the core issue: supporting emojis with variation selectors (VS16) in tag parsing, which matches the primary change.
Linked Issues check	✅ Passed	The code change successfully addresses issue #5495 by extending isTagChar to recognize Unicode combining marks (\p{M}) that include VS16 and zero-width joiner (\u200D), enabling proper tag parsing for emojis with variation selectors.
Out of Scope Changes check	✅ Passed	All changes in the pull request are directly scoped to fixing tag parsing for emojis with variation selectors as specified in issue #5495, with no unrelated modifications.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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