Nav UX/UI improved, ride time added, city navigation enhanced.

I improved the GPS feature so that it doesn't not use old cahced locations, and it notifies the user when a GPS location is not available indoors and prompts the user to enter a starting location. Also made several improvements. GPS stream if (!mounted) return guard Prevented a crash when stopping navigation while GPS was still streaming 2 GPS stream onError handler GPS errors now stop tracking instead of silently draining battery 3 Nominatim lat/lon handles numeric or string Prevented a type-cast crash on geocoding that could silently break address search 4 10-second timeout on Nominatim requests Address search can no longer hang forever on a slow network 5 Null check on Indego station geometry Prevented a crash if the Indego API ever returns a station with missing coordinates 6 Navigation distance threshold 100→1000m Fixed "In 0.05 km" displaying instead of "50 m" during navigation 7 deniedForever permission → "Open Settings" dialog Users who permanently denied GPS now get a path to fix it instead of a dead-end snackbar 8 Overpass query uses class constants instead of hardcoded bounds Both bike shop queries now stay in sync with the rest of the app's Philly bounds

Search-by-Name was added so users can search for businesses and landmarks in Philly by name. UI updates were added so that users are notified when a new app version is available.