fix-checked-arithmetic-footprint - #426
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Closes #401
Closes #403
Closes #406
This PR hardens dispute split and yield accrual arithmetic against overflow/underflow by using checked operations and returning Error::InvalidAmount on invalid extremes. It also reduces the persistent storage footprint of extend_milestone_deadline by writing the extension to temporary storage while preserving backward-compatible reads from the old persistent key. Added tests cover i128::MAX and i128::MIN edge cases and confirm normal behavior remains unchanged.