fix: align charged gas with EIP-7623 calldata floor after refunds

[mmsqe]

Description

EIP-7623 requires charged gas to be at least the calldata floor. The check was applied up front but not re-enforced after refunds, letting final amount drop below the floor and diverge from go-ethereum. This clamps gasUsed up to floorDataGas after refunds in ApplyMessageWithConfig when rules.IsPrague.

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Author Checklist

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I have...

• tackled an existing issue or discussed with a team member
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[greptile-apps]

PR author is not in the allowed authors list.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.99%. Comparing base (a739fe1) to head (644ea7e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1186      +/-   ##
==========================================
- Coverage   66.99%   66.99%   -0.01%     
==========================================
  Files         320      320              
  Lines       23436    23439       +3     
==========================================
+ Hits        15702    15703       +1     
- Misses       6576     6578       +2     
  Partials     1158     1158              

Files with missing lines	Coverage Δ
x/vm/keeper/state_transition.go	85.42% <100.00%> (+0.12%)	⬆️

... and 1 file with indirect coverage changes

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[aljo242]

fix looks correct, two nits before merge:

1. state_transition.go:597: the #nosec G115 on int64(floorDataGas) suppresses the warning but gives no explanation. add a brief comment on why overflow is unreachable (e.g. gas values are bounded by block gas limit, far below MaxInt64).

2. pr description is still the template placeholder: Closes: #XXXX, all checklist items unchecked, no description of what changed. please fill in before merge.

[aljo242]

nosec comment missing explanation; pr description is still the template placeholder.

[github-actions]

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