fix: return zero value for Int, Uint, and Dec when unmarshalling empty bytes

[amir-deris]

Problem

When Int, Uint, or Dec protobuf Unmarshal methods received an empty byte slice, they returned without initializing the underlying *big.Int, leaving the struct in a nil/invalid state. This would cause panics on subsequent operations like Equal(), arithmetic, etc.

Fix

Return the proper zero value (ZeroInt(), ZeroUint(), ZeroDec()) when the input data is empty, rather than leaving the struct uninitialized.

Files Changed

• sei-cosmos/types/int.go — Int.Unmarshal
• sei-cosmos/types/uint.go — Uint.Unmarshal
• sei-cosmos/types/decimal.go — Dec.Unmarshal
• Corresponding test files with coverage for the empty-bytes case

[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	Apr 10, 2026, 7:59 AM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.26%. Comparing base (1f4724d) to head (cff10bb).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3221      +/-   ##
==========================================
+ Coverage   59.00%   59.26%   +0.26%     
==========================================
  Files        2065     2065              
  Lines      169422   169410      -12     
==========================================
+ Hits        99959   100398     +439     
+ Misses      60700    60261     -439     
+ Partials     8763     8751      -12     

Flag	Coverage Δ
sei-chain-pr	87.97% <100.00%> (?)
sei-db	70.41% <ø> (ø)

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

Files with missing lines	Coverage Δ
sei-cosmos/types/decimal.go	87.33% <100.00%> (+0.77%)	⬆️
sei-cosmos/types/int.go	88.94% <100.00%> (+1.50%)	⬆️
sei-cosmos/types/uint.go	85.71% <100.00%> (+2.38%)	⬆️

... and 31 files with indirect coverage changes

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