fix: remeasure columns when rows added

[Wroud]

#3725

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.65%. Comparing base (79d9662) to head (d8d6976).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3726   +/-   ##
=======================================
  Coverage   98.65%   98.65%           
=======================================
  Files          47       47           
  Lines        3423     3429    +6     
  Branches      742      743    +1     
=======================================
+ Hits         3377     3383    +6     
  Misses         46       46           

Files with missing lines	Coverage Δ
src/DataGrid.tsx	99.78% <100.00%> (+<0.01%)	⬆️
src/hooks/useColumnWidths.ts	95.69% <100.00%> (+0.24%)	⬆️