Route shrinks to infinitesimal size after panning out of course tracking in CarPlay

Nobody has claimed this yet.

If the user starts navigation on CarPlay, pans the map, and waits for the navigation bar to disappear automatically, the map goes into overview mode all by itself and zooms out way too far.

`viewSafeAreaInsetsDidChange()` uses `userTrackingMode` to determine whether to apply an edge padding that takes up the entire map for the purpose of anchoring the user puck at a specific location. But this Boolean is insufficient for expressing the third state where we’re neither tracking the user’s location nor in overview mode.

https://github.com/mapbox/mapbox-navigation-ios/blob/4274aced2d02de0d5f416d416aaab3b228d1257b/MapboxNavigation/CarPlayNavigationViewController.swift#L190-L193

#2097 and #2048 have pretty much the same root cause. It may be time to finally revisit #1741.

/cc @mapbox/navigation-ios

Start in CarPlayNavigationViewController.swift around lines 190-193 and trace how viewSafeAreaInsetsDidChange() uses userTrackingMode during CarPlay navigation. Compare the related root-cause reports in #2097, #2048, and #1741, then reproduce the panning and navigation-bar dismissal sequence. Done means the route no longer shrinks to an unusably small size or zooms out unexpectedly.

Written by the indexing model from the issue text.