refactor(ui): replace type StyleValue with CSSProperties

[chouchouji]

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• Fix linting errors
• Tests have been added / updated (or snapshots)

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Name	Status	Preview	Comments	Updated (UTC)
varlet	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 28, 2023 7:26am

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[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (a8fbb35) 93.38% compared to head (95e0d9e) 93.38%.
Report is 1 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #1198   +/-   ##
=======================================
  Coverage   93.38%   93.38%           
=======================================
  Files         285      285           
  Lines        6254     6254           
  Branches     1516     1515    -1     
=======================================
  Hits         5840     5840           
  Misses        356      356           
  Partials       58       58           

Files	Coverage Δ
packages/varlet-ui/src/app-bar/AppBar.vue	100.00% <100.00%> (ø)
...ackages/varlet-ui/src/avatar-group/AvatarGroup.vue	100.00% <100.00%> (ø)
packages/varlet-ui/src/cell/Cell.vue	93.75% <100.00%> (ø)

... and 1 file with indirect coverage changes

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