fix(docs): default text style in doc

[Jocs]

close https://github.com/dream-num/univer-pro/issues/3052
close https://github.com/dream-num/univer-pro/issues/2835

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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[github-actions]

Playwright test results

 19 passed

Details

 19 tests across 9 suites
 4 minutes, 38 seconds
 f4b020f
 For more information, see full report

[codecov]

Codecov Report

Attention: Patch coverage is 13.33333% with 39 lines in your changes missing coverage. Please review.

Project coverage is 32.30%. Comparing base (51f1616) to head (f4b020f).
Report is 4 commits behind head on dev.

Files with missing lines	Patch %	Lines
...ges/docs-ui/src/services/doc-menu-style.service.ts	30.00%	14 Missing ⚠️
packages/docs-ui/src/basics/paragraph.ts	0.00%	8 Missing ⚠️
...docs-ui/src/commands/commands/ime-input.command.ts	0.00%	6 Missing ⚠️
...ocs-ui/src/commands/commands/break-line.command.ts	0.00%	5 Missing ⚠️
packages/docs-ui/src/controllers/menu/menu.ts	0.00%	4 Missing ⚠️
...rollers/render-controllers/doc-input.controller.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #3906      +/-   ##
==========================================
- Coverage   32.31%   32.30%   -0.01%     
==========================================
  Files        2456     2456              
  Lines      125858   125903      +45     
  Branches    28104    28113       +9     
==========================================
+ Hits        40672    40677       +5     
- Misses      85186    85226      +40     

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[oumomomo]

在不同字号的内容A后使用换行，新输入的内容预期应该跟内容A的字号&文本格式一致
2024_10_31 16_52_58 video.webm

[univer-bot]

Bot detected the issue body's language is not English, translate it automatically. 👯👭🏻🧑‍🤝‍🧑👫🧑🏿‍🤝‍🧑🏻👩🏾‍🤝‍👨🏿👬🏿

Use line breaks after content A with different font sizes. The newly entered content is expected to be consistent with the font size & text format of content A.
2024_10_31 16_52_58 video.webm