feat(doc): support char which length is great than 1

[Jocs]

Support char like '𠮷'.

[github-actions]

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📑 Examples	📚 Storybook
🔗 Preview link	🔗 Preview link

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 29.78%. Comparing base (8d8e615) to head (373bba7).

Files	Patch %	Lines
.../components/docs/layout/block/paragraph/shaping.ts	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1783      +/-   ##
==========================================
- Coverage   29.78%   29.78%   -0.01%     
==========================================
  Files        1143     1143              
  Lines       62044    62046       +2     
  Branches    13020    13021       +1     
==========================================
  Hits        18482    18482              
- Misses      43562    43564       +2     

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