Feat/618 campaign status history

[Kenlachy]

Fix #618: Campaign status history - queryable log of all status changes

Summary

Adds get_status_history(campaign_id) function to the campaign-funding contract, allowing sponsors to view the full timeline of a campaign's lifecycle with timestamps for each status transition.

Problem

Previously, there was no way to track the complete history of status changes for a campaign. Sponsors and contributors could only see the current status, not when and how the campaign transitioned through different states (Active → Successful/Failed → Claimed).

Solution

• Added StatusHistoryEntry struct to store (status, timestamp) tuples
• Added storage keys for status history entries and count
• Implemented record_status_change helper function to log status transitions
• Added get_status_history public query function to retrieve full history
• Integrated status logging at all status change points:
  • Campaign creation (Active)
  • Auto-success on hard cap reached (Successful)
  • Manual expiry trigger (Successful or Failed)
  • Fund claiming (Claimed)
• Added comprehensive test coverage for all status transitions

Changes

• Modified contracts/campaign-funding/src/lib.rs:
  • Added StatusHistoryEntry struct with status and timestamp fields
  • Added StatusHistory(u64, u32) and StatusHistoryCount(u64) storage keys
  • Added record_status_change private helper function
  • Added get_status_history public query function
  • Updated create_campaign to log initial Active status
  • Updated contribute to log Successful status on auto-success
  • Updated trigger_expiry to log Successful/Failed status
  • Updated claim_funds to log Claimed status
  • Added 5 test functions for status history functionality

Testing

• test_status_history_records_initial_active - Verifies initial Active status is logged
• test_status_history_records_successful_transition - Tests auto-success transition
• test_status_history_records_failed_transition - Tests expiry failure transition
• test_status_history_records_claimed_transition - Tests full lifecycle (Active → Successful → Claimed)
• test_status_history_empty_for_nonexistent_campaign - Tests edge case for non-existent campaigns

All tests verify correct status values and timestamps in chronological order.

Related Issue

Fixes #618

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[Utilitycoder]

Please fix up the merge conflict and update your PR. Kindly ensure you offramp with Fundable at https://stellar.fundable.finance/offramp

[Utilitycoder]

Please fix up the merge conflict and update your PR. Kindly ensure you offramp with Fundable at https://stellar.fundable.finance/offramp

[Kenlachy]

i have fixed it.

[Idrhas]

Fix your conflicts to get PR merged, and don't forget to use https://stellar.fundable.finance for your offramps

[Idrhas]

Fix your conflicts to get PR merged, and don't forget to use https://stellar.fundable.finance for your offramps