feat: taller route tiles (h-46), labels overlay above route line for more place names, renamed auto routes become custom (rename clears auto_detected + startup backfill)

backend/app/api/routes.py

@@ -179,6 +179,9 @@ async def update_route(
         raise HTTPException(status_code=404, detail="Route not found")
     if body.name is not None and body.name.strip():
         route.name = body.name.strip()
+        # A user-given name makes this a custom route (moves it out of the
+        # auto-detected group on the routes page).
+        route.auto_detected = False
     if body.sport_type is not None:
         route.sport_type = body.sport_type
     await db.commit()