fix: empty close tag grammar for shiki

[DylanPiercey]

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🦋 Changeset detected

Latest commit: 305dbf0

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
marko-vscode	Patch

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[coderabbitai]

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Walkthrough

This pull request updates the syntax highlighting grammar for the Marko Visual Studio Code extension to properly handle empty closing tags in shiki. The changes modify the language grammar patterns to recognize standalone closing tags (</>) alongside existing tag patterns. The grammar rules are updated with new negative lookbehind patterns and refined character class matching to improve closing tag recognition. Additionally, a changeset entry documents this patch-level release.

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix-syntax-highligting-shiki

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📒 Files selected for processing (2)

• .changeset/cool-dodos-drive.md (1 hunks)
• packages/vscode/syntaxes/marko.tmLanguage.json (7 hunks)

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