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 24, 2026, 3:10 PM

[codecov]

Codecov Report

❌ Patch coverage is 0% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 52.11%. Comparing base (1b1e9a2) to head (0a75710).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
app/app.go	0.00%	13 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2963       +/-   ##
===========================================
- Coverage   58.14%   52.11%    -6.03%     
===========================================
  Files        2107       20     -2087     
  Lines      173322     3730   -169592     
===========================================
- Hits       100780     1944    -98836     
+ Misses      63602     1611    -61991     
+ Partials     8940      175     -8765     

Flag	Coverage Δ
sei-chain	49.83% <0.00%> (-8.29%)	⬇️
sei-db	68.49% <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	56.79% <0.00%> (-15.59%)	⬇️

... and 2090 files with indirect coverage changes

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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