feat(giga): more checks to match v2 correctness

[arajasek]

Describe your changes and provide context

This should be the last of the needed check to get correctness with v2. All of these are pretty unlikely to be hit (I assume mempool logic covers most of these things), but we should still have them in.

Testing performed to validate your change

[arajasek]

Draft until confirmed working on pacific.

[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	Mar 12, 2026, 5:13 PM

[codecov]

Codecov Report

❌ Patch coverage is 0% with 91 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.23%. Comparing base (bbb938e) to head (a5dfd66).

Files with missing lines	Patch %	Lines
app/app.go	0.00%	91 Missing ⚠️

Additional details and impacted files

@@                   Coverage Diff                   @@
##           asr/giga-misc-fixes    #3061      +/-   ##
=======================================================
- Coverage                58.25%   58.23%   -0.03%     
=======================================================
  Files                     2072     2072              
  Lines                   171470   171550      +80     
=======================================================
- Hits                     99897    99896       -1     
- Misses                   62662    62744      +82     
+ Partials                  8911     8910       -1     

Flag	Coverage Δ
sei-chain-pr	46.81% <0.00%> (-1.13%)	⬇️
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
app/app.go	63.21% <0.00%> (-3.70%)	⬇️

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[arajasek]

Subsumed by #3071