- Add 50m explore radius that follows player when outside homebase
- Secondary reveal circle only appears when player is outside 800m homebase radius
- Update isInRevealedArea() to check both homebase and player position
- Update fog of war on GPS position changes and after combat
- Geocaches within player's explore radius now become visible
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>