feat(shortcuts): guess embedded language and auto load in shortcuts

[antfu]

fix for vuejs/vitepress#4564

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[netlify]

✅ Deploy Preview for shiki-matsu ready!

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[codecov]

Codecov Report

Attention: Patch coverage is 90.19608% with 5 lines in your changes missing coverage. Please review.

Project coverage is 94.38%. Comparing base (26d621c) to head (135a240).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/core/src/constructors/bundle-factory.ts	86.95%	3 Missing ⚠️
packages/shiki/src/guess.ts	89.47%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #932   +/-   ##
=======================================
  Coverage   94.37%   94.38%           
=======================================
  Files          91       92    +1     
  Lines        7483     7513   +30     
  Branches     1538     1545    +7     
=======================================
+ Hits         7062     7091   +29     
- Misses        412      413    +1     
  Partials        9        9           

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