fix: css style should not apply on nested editor's viewport

[AyushAgrawal-A2]

AFF-610

[nx-cloud]

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✅ Successfully ran 6 targets

• nx test:coverage @affine/monorepo
• nx build @affine/native -- --target x86_64-pc-windows-msvc --use-napi-cross
• nx build @affine/storage -- --target x86_64-unknown-linux-gnu --use-napi-cross
• nx build @affine/native -- --target x86_64-apple-darwin --use-napi-cross
• nx build @affine/native -- --target aarch64-apple-darwin --use-napi-cross
• nx build @affine/native -- --target x86_64-unknown-linux-gnu --use-napi-cross

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (67dffc2) 64.65% compared to head (f049bf3) 64.56%.

Additional details and impacted files

@@            Coverage Diff             @@
##           canary    #5859      +/-   ##
==========================================
- Coverage   64.65%   64.56%   -0.10%     
==========================================
  Files         358      358              
  Lines       19906    19906              
  Branches     1697     1696       -1     
==========================================
- Hits        12871    12852      -19     
- Misses       6816     6835      +19     
  Partials      219      219              

Flag	Coverage Δ
server-test	71.35% <ø> (-0.13%)	⬇️
unittest	45.39% <ø> (ø)

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