feat: scroll bar hover style

[lumixraku]

close #xxx

Pull Request Checklist

• Related tickets or issues have been linked in the PR description (or missing issue).
• Naming convention is followed (do please check it especially when you created new plugins, commands and resources).
• Unit tests have been added for the changes (if applicable).
• Breaking changes have been documented (or no breaking changes introduced in this PR).

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Playwright test results

 24 passed

Details

 24 tests across 11 suites
 5 minutes, 31 seconds
 2e6d1a5
 For more information, see full report

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 296 lines in your changes missing coverage. Please review.

Project coverage is 32.60%. Comparing base (2bfba12) to head (2e6d1a5).
Report is 8 commits behind head on dev.

Files with missing lines	Patch %	Lines
...ackages/engine-render/src/shape/base-scroll-bar.ts	0.00%	295 Missing ⚠️
packages/engine-render/src/viewport.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #4708      +/-   ##
==========================================
- Coverage   32.65%   32.60%   -0.06%     
==========================================
  Files        2606     2603       -3     
  Lines      135710   135822     +112     
  Branches    30212    30220       +8     
==========================================
- Hits        44319    44283      -36     
- Misses      91391    91539     +148     

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