feat(editor): style and placeholder

[DR-Univer]

• editor style
• selector style
• placeholder
• fix select range bug

close #

[github-actions]

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 36 lines in your changes are missing coverage. Please review.

Project coverage is 32.81%. Comparing base (bba50e7) to head (13f0d07).
Report is 1 commits behind head on dev.

Files	Patch %	Lines
packages/ui/src/components/editor/TextEditor.tsx	0.00%	14 Missing ⚠️
...ui/src/components/range-selector/RangeSelector.tsx	0.00%	13 Missing ⚠️
packages/ui/src/services/editor/editor.service.ts	0.00%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1571      +/-   ##
==========================================
- Coverage   32.83%   32.81%   -0.02%     
==========================================
  Files         919      919              
  Lines       51237    51265      +28     
  Branches    10668    10680      +12     
==========================================
  Hits        16825    16825              
- Misses      34412    34440      +28     

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