better visual coherence

frontend/lib/structs/landmark.dart

@@ -4,13 +4,13 @@ import 'dart:convert';
 import 'package:flutter/material.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 
-LandmarkType sightseeing = LandmarkType(name: 'sightseeing');
-LandmarkType nature = LandmarkType(name: 'nature');
-LandmarkType shopping = LandmarkType(name: 'shopping');
+LandmarkType typeSightseeing = LandmarkType(name: 'sightseeing');
+LandmarkType typeNature = LandmarkType(name: 'nature');
+LandmarkType typeShopping = LandmarkType(name: 'shopping');
 // LandmarkType museum = LandmarkType(name: 'Museum');
 // LandmarkType restaurant = LandmarkType(name: 'Restaurant');
-LandmarkType start = LandmarkType(name: 'start');
-LandmarkType finish = LandmarkType(name: 'finish');
+LandmarkType typeStart = LandmarkType(name: 'start');
+LandmarkType typeFinish = LandmarkType(name: 'finish');
 
 
 final class Landmark extends LinkedListEntry<Landmark>{
@@ -130,22 +130,22 @@ class LandmarkType {
   LandmarkType({required this.name, this.icon = const Icon(Icons.location_on)}) {
     switch (name) {
       case 'sightseeing':
-        icon = Icon(Icons.church);
+        icon = const Icon(Icons.church);
         break;
       case 'nature':
-        icon = Icon(Icons.eco);
+        icon = const Icon(Icons.eco);
         break;
       case 'shopping':
-        icon = Icon(Icons.shopping_cart);
+        icon = const Icon(Icons.shopping_cart);
         break;
       case 'start':
-        icon = Icon(Icons.play_arrow);
+        icon = const Icon(Icons.play_arrow);
         break;
       case 'finish':
-        icon = Icon(Icons.flag);
+        icon = const Icon(Icons.flag);
         break;
       default:
-        icon = Icon(Icons.location_on);
+        icon = const Icon(Icons.location_on);
     }
   }
   @override

frontend/lib/structs/preferences.dart

@@ -1,3 +1,4 @@
+import 'package:anyway/structs/landmark.dart';
 import 'package:flutter/material.dart';
 
 
@@ -28,27 +29,27 @@ class UserPreferences {
     slug: "sightseeing",
     description: "How much do you like sightseeing?",
     value: 0,
-    icon: Icon(Icons.church),
+    icon: typeSightseeing.icon,
   );
   SinglePreference shopping = SinglePreference(
     name: "Shopping",
     slug: "shopping",
     description: "How much do you like shopping?",
     value: 0,
-    icon: Icon(Icons.shopping_bag),
+    icon: typeShopping.icon,
   );
   SinglePreference nature = SinglePreference(
     name: "Nature",
     slug: "nature",
     description: "How much do you like nature?",
     value: 0,
-    icon: Icon(Icons.landscape),
+    icon: typeNature.icon,
   );
 
   SinglePreference maxTime = SinglePreference(
     name: "Trip duration",
     slug: "duration",
-    description: "How long do you want your trip to be?",
+    description: "How long should your trip be?",
     value: 30,
     minVal: 30,
     maxVal: 720,