Gallery Block: Fix sizes issue for responsive screens

[mukeshpanchal27]

Summary

Follow-up of #2534 (comment) discussion.

Relevant technical choices

Use of AI Tools

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.25%. Comparing base (03ef805) to head (4958bd7).

Additional details and impacted files

@@                     Coverage Diff                     @@
##           fix/2449-different-columns    #2551   +/-   ##
===========================================================
  Coverage                       69.24%   69.25%           
===========================================================
  Files                              90       90           
  Lines                            7755     7753    -2     
===========================================================
- Hits                             5370     5369    -1     
+ Misses                           2385     2384    -1     

Flag	Coverage Δ
multisite	69.25% <100.00%> (+<0.01%)	⬆️
single	35.74% <100.00%> (-0.01%)	⬇️

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