feat: Allow campaign owners to cancel before funding completes

[0xdevcollins]

Summary

• Adds owner_cancel_campaign(campaign_id) — owner-authed cancel for Draft, Submitted, or Campaigning states
• Returns InvalidState if campaign is Funded or beyond (milestones in progress)
• Sets refund_progress = 0 so existing pledges are refundable via process_refund_batch()
• Clears vote_session_id if cancelling from Submitted
• Emits CampaignCancelledByOwner event (distinct from admin's CampaignCancelled)

Closes #6

Test plan

• test_owner_cancel_in_draft — owner cancels in Draft status
• test_owner_cancel_in_campaigning_with_refunds — owner cancels with existing pledges → refunds work
• test_owner_cancel_after_funded_fails — cannot cancel after campaign is Funded
• All 127 tests pass (22 unit + 57 integration + 48 other crates)

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 30580ff2-20d4-41c2-8f3c-d45c8fffa7cc

📥 Commits

Reviewing files that changed from the base of the PR and between 2f7dcda and c1eed37.

📒 Files selected for processing (6)

• contracts/crowdfund_registry/src/contract.rs
• contracts/crowdfund_registry/src/events/mod.rs
• contracts/crowdfund_registry/src/tests/mod.rs
• contracts/crowdfund_registry/test_snapshots/tests/test_owner_cancel_after_funded_fails.1.json
• contracts/crowdfund_registry/test_snapshots/tests/test_owner_cancel_in_campaigning_with_refunds.1.json
• contracts/crowdfund_registry/test_snapshots/tests/test_owner_cancel_in_draft.1.json

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/owner-cancel-campaign

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