Live location:
- Crosshair button on the map toggles GPS tracking
- Blue dot shows live position with accuracy circle (<500m)
- Uses watchPosition for continuous updates
- Button turns blue when active, click again to stop
Auto-sort:
- Places with a time now auto-sort chronologically among other
timed items (transports, other timed places)
- Adding a time to a place immediately moves it to the correct
position in the timeline
- Untimed places keep their manual order_index
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