feat(editor): improve group title display for checkbox columns

[zzj3720]

close: BS-1977

[graphite-app]

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[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 52.86%. Comparing base (8e8058a) to head (20ca4f3).

Files with missing lines	Patch %	Lines
.../affine/data-view/src/core/group-by/group-title.ts	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           canary    #9622      +/-   ##
==========================================
+ Coverage   52.84%   52.86%   +0.02%     
==========================================
  Files        2180     2180              
  Lines       98430    98434       +4     
  Branches    16693    16694       +1     
==========================================
+ Hits        52012    52040      +28     
+ Misses      45014    44952      -62     
- Partials     1404     1442      +38     

Flag	Coverage Δ
server-test	77.83% <ø> (-0.04%)	⬇️
unittest	32.35% <0.00%> (+0.05%)	⬆️

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