fix: scroll cmd for pointer down at scrolltrack

[lumixraku]

close #3191

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

 4 passed

Details

 4 tests across 2 suites
 1 minute, 23 seconds
 56cdf4e
 For more information, see full report

[codecov]

Codecov Report

Attention: Patch coverage is 2.94118% with 132 lines in your changes missing coverage. Please review.

Project coverage is 30.59%. Comparing base (4b86a65) to head (56cdf4e).
Report is 44 commits behind head on dev.

Files with missing lines	Patch %	Lines
packages/engine-render/src/shape/scroll-bar.ts	0.00%	64 Missing ⚠️
...ers/render-controllers/scroll.render-controller.ts	0.00%	55 Missing ⚠️
...ackages/engine-render/src/shape/base-scroll-bar.ts	0.00%	8 Missing ⚠️
packages/engine-render/src/viewport.ts	0.00%	3 Missing ⚠️
...der-controllers/header-resize.render-controller.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #3429   +/-   ##
=======================================
  Coverage   30.59%   30.59%           
=======================================
  Files        2156     2156           
  Lines      112917   112909    -8     
  Branches    24764    24761    -3     
=======================================
  Hits        34546    34546           
+ Misses      78371    78363    -8     

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