reworked page layout inheritence

frontend/lib/modules/step_between_landmarks.dart

@@ -1,7 +1,9 @@
-import 'package:anyway/structs/landmark.dart';
 import 'package:flutter/material.dart';
+
+import 'package:anyway/structs/landmark.dart';
 import 'package:anyway/modules/map_chooser.dart';
 
+
 class StepBetweenLandmarks extends StatefulWidget {
   final Landmark current;
   final Landmark next;
@@ -19,11 +21,15 @@ class StepBetweenLandmarks extends StatefulWidget {
 class _StepBetweenLandmarksState extends State<StepBetweenLandmarks> {
   @override
   Widget build(BuildContext context) {
-    int time = widget.current.tripTime?.inMinutes ?? 0;
+    int? time = widget.current.tripTime?.inMinutes;
+    if (time != null && time < 1) {
+      time = 1;
+    }
+
     return Container(
-      margin: EdgeInsets.all(10),
-      padding: EdgeInsets.all(10),
-      decoration: BoxDecoration(
+      margin: const EdgeInsets.all(10),
+      padding: const EdgeInsets.all(10),
+      decoration: const BoxDecoration(
         border: Border(
           left: BorderSide(width: 3.0, color: Colors.black),
         ),
@@ -32,21 +38,22 @@ class _StepBetweenLandmarksState extends State<StepBetweenLandmarks> {
         children: [
           Column(
             children: [
-              Icon(Icons.directions_walk),
-              Text("$time min", style: TextStyle(fontSize: 10)),
+              const Icon(Icons.directions_walk),
+              Text(
+                time == null ? "" : "About $time min",
+                style: const TextStyle(fontSize: 10)
+              ),
             ],
           ),
-          Spacer(),
-          ElevatedButton(
+
+          const Spacer(),
+
+          ElevatedButton.icon(
             onPressed: () async {
               showMapChooser(context, widget.current, widget.next);
             },
-            child: Row(
-              children: [
-                Icon(Icons.directions),
-                Text("Directions"),
-              ],
-            ),
+            icon: const Icon(Icons.directions),
+            label: const Text("Directions"),
           )
         ],
       ),