fix(giga): match panic recovery to v2

[arajasek]

Describe your changes and provide context

• Seq mode needs to trap panics
• OCC mode needs to lower panics to the appropriate error code: ErrOCCAbort, ErrOutOfGas, or ErrPanic

Testing performed to validate your change

tests pass

[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, 1:30 PM

[arajasek]

Draft until confirmed it syncs mainnet well

[codecov]

Codecov Report

❌ Patch coverage is 0% with 25 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.25%. Comparing base (aa89d27) to head (bbb938e).

Files with missing lines	Patch %	Lines
app/app.go	0.00%	25 Missing ⚠️

Additional details and impacted files

@@                     Coverage Diff                      @@
##           asr/fee-validation-nonce    #3045      +/-   ##
============================================================
- Coverage                     58.26%   58.25%   -0.01%     
============================================================
  Files                          2072     2072              
  Lines                        171449   171470      +21     
============================================================
- Hits                          99899    99897       -2     
- Misses                        62638    62662      +24     
+ Partials                       8912     8911       -1     

Flag	Coverage Δ
sei-chain-pr	47.93% <0.00%> (-0.31%)	⬇️
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	66.90% <0.00%> (-1.17%)	⬇️

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