fix(render): rect blurring

[DR-Univer]

• I am sure that the code is update-to-date with the dev branch.

close #

[github-actions]

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 72 lines in your changes are missing coverage. Please review.

Project coverage is 32.75%. Comparing base (c8c7bf3) to head (cdd0315).

Files	Patch %	Lines
packages/engine-render/src/context.ts	0.00%	34 Missing ⚠️
...engine-render/src/components/sheets/spreadsheet.ts	0.00%	14 Missing ⚠️
...mponents/sheets/extensions/column-header-layout.ts	0.00%	5 Missing ⚠️
.../components/sheets/extensions/row-header-layout.ts	0.00%	5 Missing ⚠️
packages/engine-render/src/basics/draw.ts	0.00%	4 Missing ⚠️
...der/src/components/sheets/extensions/background.ts	0.00%	4 Missing ⚠️
...ne-render/src/components/sheets/extensions/font.ts	0.00%	3 Missing ⚠️
...gine-render/src/components/docs/extensions/line.ts	0.00%	2 Missing ⚠️
...ender/src/components/docs/extensions/background.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1511      +/-   ##
==========================================
- Coverage   32.76%   32.75%   -0.02%     
==========================================
  Files         914      914              
  Lines       50754    50776      +22     
  Branches    10588    10588              
==========================================
  Hits        16630    16630              
- Misses      34124    34146      +22     

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