style: improve outline treenode style

[erha19]

Types

• 💄 Style Changes

Background or solution

close #2315.

After:

Changelog

improve outline treenode style

[codecov]

Codecov Report

Base: 57.77% // Head: 57.76% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (7a6daaf) compared to base (ea6688e).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2329      +/-   ##
==========================================
- Coverage   57.77%   57.76%   -0.01%     
==========================================
  Files        1322     1322              
  Lines       83276    83276              
  Branches    17332    17332              
==========================================
- Hits        48112    48105       -7     
- Misses      31956    31962       +6     
- Partials     3208     3209       +1     

Flag	Coverage Δ
jsdom	52.73% <100.00%> (-0.01%)	⬇️
node	16.84% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ages/editor/src/browser/preference/contribution.ts	100.00% <100.00%> (ø)
packages/utils/src/buffer.ts	29.65% <0.00%> (-4.07%)	⬇️

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