revamp new trip flow

frontend/lib/structs/preferences.dart

@@ -1,5 +1,4 @@
 import 'package:flutter/material.dart';
-import 'package:shared_preferences/shared_preferences.dart';
 
 
 class SinglePreference {
@@ -20,16 +19,6 @@ class SinglePreference {
     this.minVal = 0,
     this.maxVal = 5,
   });
-
-  void save() async {
-    SharedPreferences sharedPrefs = await SharedPreferences.getInstance();
-      sharedPrefs.setInt('pref_$slug', value);
-  }
-
-  void load() async {
-    SharedPreferences sharedPrefs = await SharedPreferences.getInstance();
-      value = sharedPrefs.getInt('pref_$slug') ?? minVal;
-  }
 }
 
 
@@ -65,38 +54,15 @@ class UserPreferences {
     maxVal: 720,
     icon: Icon(Icons.timer),
   );
-  SinglePreference maxDetour = SinglePreference(
-    name: "Trip detours",
-    slug: "detours",
-    description: "Are you okay with roaming even if makes the trip longer?",
-    value: 0,
-    maxVal: 30,
-    icon: Icon(Icons.loupe_sharp),
-  );
 
 
-
-  Future<void> load() async {
-    for (SinglePreference pref in [sightseeing, shopping, nature, maxTime, maxDetour]) {
-      pref.load();
-    }
-  }
-
   Map<String, dynamic> toJson() {
       // This is "opinionated" JSON, corresponding to the backend's expectations
       return {
         "sightseeing": {"type": "sightseeing", "score": sightseeing.value},
         "shopping": {"type": "shopping", "score": shopping.value},
         "nature": {"type": "nature", "score": nature.value},
-        "max_time_minute": maxTime.value,
-        "detour_tolerance_minute": maxDetour.value
+        "max_time_minute": maxTime.value
       };
     }
-}
-
-
-Future<UserPreferences> loadUserPreferences() async {
-  UserPreferences prefs = UserPreferences();
-  await prefs.load();
-  return prefs;
 }