feat: set the initial cursor at the begining of document

[Jocs]

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).

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 27.11%. Comparing base (039a59d) to head (709d68f).

Files	Patch %	Lines
...cs-ui/src/controllers/text-selection.controller.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #2447      +/-   ##
==========================================
- Coverage   27.12%   27.11%   -0.02%     
==========================================
  Files        1653     1653              
  Lines       83300    83302       +2     
  Branches    17254    17255       +1     
==========================================
- Hits        22595    22585      -10     
- Misses      60705    60717      +12     

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[github-actions]

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