feat: implement campaign deadline enforcement in donate#203
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- Add donate() function to CampaignContract - Check env.ledger().timestamp() > campaign.end_time before accepting donation - Panic with Error::CampaignEnded when deadline has passed - Check is atomic with state update to prevent race conditions Closes Dfunder#193
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Summary
Enforces time-bound fundraising by rejecting donations after the campaign deadline.
Changes
donate()function toCampaignContractenv.ledger().timestamp() > campaign.end_timeon every donationError::CampaignEndedwhen deadline has passedCloses #193