[Stretch] CARES standings/leaderboard #286

Overview

Display a leaderboard of CARES contributors to encourage participation.

Parent: #276

Phase 4 - Polish (Stretch Goal)

Possible Rankings

• Most species registered
• Most fry sharing events (especially Red seals)
• Most articles published
• Longest active registrations (longevity)
• Total seals earned

Display

• Similar to existing BAP standings
• Annual and lifetime views
• Member cards with seal counts

Gamification Considerations

• Balance recognition with not making it feel competitive
• Focus on conservation contribution, not competition
• Consider "Member of the Year" equivalent

Acceptance Criteria

• CARES standings page accessible
• Multiple ranking categories
• Annual and lifetime views
• Integrates with existing standings UI patterns