feat(giga): add UseRegularStore in xbank keeper fork

[arajasek]

Describe your changes and provide context

Implements the same change as #2745 for the new bank keeper forked in #2737

Testing performed to validate your change

[github-actions]

The latest Buf updates on your PR. Results from workflow Buf / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Jan 26, 2026, 6:43 PM

[codecov]

Codecov Report

❌ Patch coverage is 78.57143% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 57.00%. Comparing base (2835dbd) to head (e49bda1).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
giga/deps/xbank/keeper/view.go	66.66%	1 Missing and 1 partial ⚠️
giga/deps/xbank/keeper/keeper.go	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2760      +/-   ##
==========================================
- Coverage   57.01%   57.00%   -0.02%     
==========================================
  Files        2004     2004              
  Lines      164629   164633       +4     
==========================================
- Hits        93867    93848      -19     
- Misses      62554    62572      +18     
- Partials     8208     8213       +5     

Flag	Coverage Δ
sei-chain	41.78% <78.57%> (-0.02%)	⬇️
sei-cosmos	48.02% <ø> (-0.01%)	⬇️
sei-db	68.72% <ø> (ø)
sei-tendermint	58.94% <ø> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
giga/deps/xbank/keeper/send.go	85.28% <100.00%> (ø)
giga/deps/xbank/keeper/keeper.go	44.12% <80.00%> (ø)
giga/deps/xbank/keeper/view.go	87.23% <66.66%> (-3.47%)	⬇️

... and 22 files with indirect coverage changes

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