fix(design): ensure popup component is appended to root to prevent offset from stacking contexts

[jikkai]

fix https://github.com/karlsbeard/obsidian-univer/issues/32

[github-actions]

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📑 Examples	📚 Storybook
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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 29.96%. Comparing base (6868a47) to head (340855a).

Files	Patch %	Lines
packages/design/src/components/popup/Popup.tsx	0.00%	2 Missing ⚠️
packages/ui/src/components/editor/TextEditor.tsx	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1850      +/-   ##
==========================================
- Coverage   29.96%   29.96%   -0.01%     
==========================================
  Files        1162     1162              
  Lines       63096    63097       +1     
  Branches    13265    13265              
==========================================
  Hits        18909    18909              
- Misses      44187    44188       +1     

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