test: add unit tests for useRewardDistribution (#462)

[gbengaeben]

Summary

Adds comprehensive unit tests for the useRewardDistribution hook and related hooks (useClaimRewards, useRewardDistributionStatus, useRewardDistributionValidator).

Changes

• Created src/hooks/__tests__/useRewardDistribution.test.ts with 33 tests covering:
  • useRewardDistribution: Initial state, wallet validation, chain ID mismatch, successful distribution with writeContract, error handling, reset
  • useClaimRewards: Successful claims, BigInt math verification, empty/invalid reward IDs, zero/negative amounts, wallet connectivity checks
  • useRewardDistributionStatus: Pending → confirming → confirmed → failed state transitions, receipt confirmations, txHash reset
  • useRewardDistributionValidator: Valid claims, empty rewards, zero amount, minimum amount threshold, duplicate ID detection
• Uses mocked wagmi/viem providers for accurate BigInt math verification
• All tests use renderHook from @testing-library/react

Closes #462

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[nanaf6203-bit]

Nice test addition. Merging.