Add regression test for dividend claim zeroing claimable balance after successful withdrawal

[Chucks1093]

Summary

After a holder successfully claims their dividend, their claimable balance must be set to exactly zero. Calling get_claimable_dividend after a successful claim should return zero, not the previously claimed amount. A regression test should lock in this behavior.

Scope

• Distribute a dividend to a creator with one holder
• Claim the dividend from the holder's wallet
• Call get_claimable_dividend for the same wallet and creator
• Assert the returned value is zero

Acceptance Criteria

• Claimable balance is zero after successful claim
• get_claimable_dividend returns zero, not the previously claimed amount
• A second claim attempt reverts with expected error

ETA: 12 hours

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Coordinate on Telegram

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