fix: find the first possible cursor position

[Jocs]

close https://github.com/dream-num/univer-pro/issues/2871

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

 19 passed

Details

 19 tests across 9 suites
 4 minutes, 37 seconds
 f15083e
 For more information, see full report

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 12 lines in your changes missing coverage. Please review.

Project coverage is 32.31%. Comparing base (09bb12f) to head (f15083e).
Report is 1 commits behind head on dev.

Files with missing lines	Patch %	Lines
...der-controllers/doc-selection-render.controller.ts	0.00%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #3913      +/-   ##
==========================================
- Coverage   32.31%   32.31%   -0.01%     
==========================================
  Files        2456     2456              
  Lines      125858   125870      +12     
  Branches    28104    28107       +3     
==========================================
  Hits        40672    40672              
- Misses      85186    85198      +12     

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