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 11, 2026, 1:56 PM

[arajasek]

Draft until confirmed it syncs mainnet well

[codecov]

Codecov Report

❌ Patch coverage is 0% with 112 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.30%. Comparing base (2bb2537) to head (29ab486).

Files with missing lines	Patch %	Lines
app/app.go	0.00%	112 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3045      +/-   ##
==========================================
- Coverage   58.33%   58.30%   -0.03%     
==========================================
  Files        2079     2079              
  Lines      171885   171941      +56     
==========================================
- Hits       100268   100256      -12     
- Misses      62671    62749      +78     
+ Partials     8946     8936      -10     

Flag	Coverage Δ
sei-chain-pr	47.97% <0.00%> (?)
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
app/app.go	66.90% <0.00%> (-3.70%)	⬇️

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