fix: convert emoji in markdown text tokens

[Semak12345]

Closes#2822

Moves emoji conversion into the marked text renderer instead of scanning rendered HTML for code tags. Inline code, fenced code, and escaped shortcodes now bypass conversion naturally. Shortcode-based heading anchors remain unchanged.

Tested with:

• 109 targeted unit tests
• formatter and lint
• full workspace typecheck

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[coderabbitai]

📝 Walkthrough

Walkthrough

Changes

Emoji rendering and heading slugs

Layer / File(s)	Summary
Token-aware Markdown rendering server/utils/mdKit.ts, shared/utils/emoji.ts	Adds Marked text-token emoji rendering, token-based heading slug extraction, and plain-text shortcode conversion with unknown shortcode preservation.
README and changelog integration server/utils/readme.ts, server/utils/changelog/markdown.ts	Moves emoji conversion into the Marked rendering pipeline and sanitises rendered HTML directly.
Emoji and heading rendering tests test/unit/server/utils/readme.spec.ts, test/unit/server/utils/changelog/markdown.spec.ts, test/unit/shared/utils/emoji.spec.ts	Verifies conversion in normal text, preservation inside inline code, unknown shortcode handling, and README heading anchor generation.

Sequence Diagram(s)

sequenceDiagram
participant MarkdownInput
participant MarkdownRenderer
participant emojiText
participant Sanitizer
MarkdownInput->>MarkdownRenderer: render markdown tokens
MarkdownRenderer->>emojiText: process text tokens
emojiText-->>MarkdownRenderer: return rendered emoji text
MarkdownRenderer->>Sanitizer: sanitise rendered HTML
Sanitizer-->>MarkdownRenderer: return sanitised HTML

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Possibly related PRs

• npmx-dev/npmx.dev#2694: Related emoji conversion changes for code contexts.

Suggested reviewers:ghostdevv, gameroman

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The PR satisfies #2822 by moving emoji conversion into the text renderer so code paths bypass it naturally.
Out of Scope Changes check	✅ Passed	No clear unrelated changes are present; the slug and test updates support the emoji-rendering refactor.
Title check	✅ Passed	The title clearly summarises the main change: emoji conversion now occurs in Markdown text tokens.
Description check	✅ Passed	The description explains the emoji-rendering change, code-path behaviour, linked issue, and validation performed.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[codecov]

Codecov Report

❌ Patch coverage is 42.85714% with 8 lines in your changes missing coverage. Please review.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
server/utils/mdKit.ts	36.36%	1 Missing and 6 partials ⚠️
shared/utils/emoji.ts	0.00%	0 Missing and 1 partial ⚠️

📢 Thoughts on this report? Let us know!

[gameroman]

Please use the pull request template

[gameroman]

Please follow the PR template