Auto-return to tile view after inactivity

Games should automatically exit and return to the tile view (opening screen) after a period of no user interaction. ~5 minutes is a starting point, but use whatever feels appropriate.

**Flow:**
1. Tile view (opening) → Hand up detected → Explanation/schedule view → Object detected → Game launches
2. If no activity for ~5 min in any game → Return to tile view

**Note:** The exit-to-tile logic has already been written and tested (working twice). If implementing from games, that existing logic should be reusable.