fix: simple table bugs

[qinluhe]

Feature Preview

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PR Checklist

• My code adheres to AppFlowy's Conventions
• I've listed at least one issue that this PR fixes in the description above.
• I've added a test(s) to validate changes in this PR, or this PR only contains semantic changes.
• All existing tests are passing.

[codecov]

Codecov Report

Attention: Patch coverage is 76.02740% with 35 lines in your changes missing coverage. Please review.

Project coverage is 64.42%. Comparing base (3522569) to head (122a994).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
...omponents/blocks/simple-table/SimpleTable.hooks.ts	0.00%	26 Missing ⚠️
...tor/components/blocks/simple-table/SimpleTable.tsx	0.00%	6 Missing ⚠️
...components/blocks/simple-table/SimpleTableCell.tsx	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6981      +/-   ##
==========================================
- Coverage   64.61%   64.42%   -0.19%     
==========================================
  Files         278      280       +2     
  Lines       10707    10738      +31     
  Branches     1442     1449       +7     
==========================================
  Hits         6918     6918              
- Misses       3615     3648      +33     
+ Partials      174      172       -2     

Flag	Coverage Δ
appflowy_web_app	64.42% <76.02%> (-0.19%)	⬇️

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