fix(sheets): no style in blank cell

[Jocs]

close https://github.com/dream-num/univer-pro/issues/993
close https://github.com/dream-num/univer-pro/issues/2069

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).

[github-actions]

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📑 Examples	📚 Storybook
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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.

Project coverage is 28.56%. Comparing base (84e8c89) to head (95a3fe4).
Report is 9 commits behind head on dev.

Files with missing lines	Patch %	Lines
...ine-render/src/components/sheets/sheet-skeleton.ts	0.00%	4 Missing ⚠️
...rc/controllers/editor/editing.render-controller.ts	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #3231      +/-   ##
==========================================
- Coverage   28.62%   28.56%   -0.06%     
==========================================
  Files        2025     2022       -3     
  Lines      106979   106775     -204     
  Branches    23134    23102      -32     
==========================================
- Hits        30623    30503     -120     
+ Misses      76356    76272      -84     

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[zhaolixin7]

@Jocs#1770 1、选中链接单元格清除内容（或delete删除）
2、单击选中该单元格直接输入内容
预期：编辑态下输入内容也显示为文本
表现：编辑态下输入新的内容仍显示链接的格式，退出后显示为文本
2024_8_29 14_26_23 commands.json
2024_8_29 14_26_23 video.webm