fix(giga): bail on wrong nonce as v2 does

[arajasek]

Describe your changes and provide context

Reopening #2877 against main

fixes mismatch of this block. there are 2 txs (don't show up on seiscan) that have invalid nonces:

V2's log: "nonce too high: address 0x6a9dE37D180C56b7E9362d7688ACa8B7acEb425C, tx: 23213 state: 23211"

V2's log: "nonce too high: address 0x4A7d9e41340d1dba4d157fdE37Ed1697E42CBC7b, tx: 7423188 state: 7423187"

In this case we just bail WITHOUT bumping the nonce.

Testing performed to validate your change

tests pass, get us past the block in question.

[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	Feb 27, 2026, 3:08 PM

[codecov]

Codecov Report

❌ Patch coverage is 0% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.12%. Comparing base (7cfe94a) to head (06a7fc6).

Files with missing lines	Patch %	Lines
app/app.go	0.00%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2963      +/-   ##
==========================================
- Coverage   58.12%   58.12%   -0.01%     
==========================================
  Files        2111     2111              
  Lines      173544   173555      +11     
==========================================
  Hits       100879   100879              
- Misses      63706    63717      +11     
  Partials     8959     8959              

Flag	Coverage Δ
sei-chain-pr	49.51% <0.00%> (?)
sei-db	69.50% <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	70.86% <0.00%> (-0.59%)	⬇️

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[codchen]

can you link where this happens for v2? from what I see the v2 ante handler would just exit with 0 gas used.

not blocking though since gas used no longer affects consensus

[arajasek]

Thanks, you're right. I confused myself with this case below when it does report a value: https://github.com/sei-protocol/sei-chain/pull/2963/changes#diff-0f1d2976054440336a576d47a44a37b80cdf6701dd9113012bce0e3c425819b7R1861