🧪 Add tests for Deadline Calendar Service

[MarsLuay]

🎯 What: Added tests to cover the Deadline Calendar Service, which previously lacked test coverage.
📊 Coverage: Covered the filterUpcomingEntries and groupEntries methods which internally rely on sorting logic to correctly handle the dates, and covered various scenarios (past entries, upcoming entries, completed entries, and far future entries).
✨ Result: Improved test coverage and provided a safety net to ensure deadline ordering works correctly in future refactors.

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PR created automatically by Jules for task 3800431412963190192 started by @MarsLuay

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Project	Deployment	Actions	Updated (UTC)
gator-guide	Ready	Preview	Aug 27, 2026 12:02am

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