Unintuitive and restrictive position tracking

[ezwelty]

When the track-position button is clicked, the device's current position is displayed on the map and the map updates to keep the current position at the center. If the map is panned, track-position is disabled and the current-position marker is removed from the map. In other words, it isn't possible to both see one's location and pan the map, which is an obvious limitation.

I propose that we:

• Display position (but stop centering on position) when map is panned. Track-position button remains active.
• Start centering on position if track-position button is clicked and active.
• Remove position and disable track-position button if track-position button is clicked while centering is active.

For the latter two, we could alternatively match the current mobile app behavior: it uses the track-position button for center-and-track / off, and adds a little blue dot to recenter-and-track after the map is panned:

Perhaps this is more intuitive, but it requires an additional control.

The mobile app also shows position uncertainty and compass heading, and it is blue, which I think is more intuitive and familiar than the current orange. I think these would be improvements. See mobile app logic and marker styling.