fix: copy cell should generate html & plain

[ybzky]

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

 20 passed
 1 flaky

Details

 21 tests across 10 suites
 5 minutes, 27 seconds
 12e6900
 For more information, see full report

Flaky tests

chromium › memory/memory.spec.ts › memory

[codecov]

Codecov Report

Attention: Patch coverage is 43.33333% with 17 lines in your changes missing coverage. Please review.

Project coverage is 33.38%. Comparing base (57467da) to head (12e6900).
Report is 3 commits behind head on dev.

Files with missing lines	Patch %	Lines
packages/core/src/sheets/worksheet.ts	0.00%	14 Missing ⚠️
packages/core/src/sheets/util.ts	0.00%	2 Missing ⚠️
...ets-ui/src/services/clipboard/clipboard.service.ts	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #4366      +/-   ##
==========================================
- Coverage   33.38%   33.38%   -0.01%     
==========================================
  Files        2529     2529              
  Lines      130299   130317      +18     
  Branches    29076    29082       +6     
==========================================
+ Hits        43503    43508       +5     
- Misses      86796    86809      +13     

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