refactor/use shiki's `transformerMetaHighlight()` and add support for multi-key meta notation like `add={1} remove={2}`#4718

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Fro-Q wants to merge 5 commits intovuejs:mainfrom

Commits on Apr 24, 2025

refactor: use shiki `transformerMetaHighlight` to do meta highlight
Fro-Q
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refactor: update highlightLines.ts to support multi-key meta notation like `add={1} remove={2}`
Fro-Q
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Merge branch 'vuejs:main' into main
Fro-Q
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fix: bug that `{1}` in `js{1} add={2}` is not dealed to result in langName being `js{1}`
Fro-Q
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Merge branch 'main' of https://github.com/Fro-Q/vitepress
Fro-Q
committed