Tracking now works via timed interval

lib/screens/settings.dart

@@ -10,36 +10,75 @@ class Settings extends StatefulWidget {
 }
 
 class _SettingsState extends State<Settings> {
+  int _trackingInterval = 60;
 
+  @override
+  void initState() {
+    super.initState();
+    _loadSettings();
+  }
+
+  Future<void> _loadSettings() async {
+    SharedPreferences prefs = await SharedPreferences.getInstance();
+    setState(() {
+      _trackingInterval = prefs.getInt('trackingInterval') ?? 60;
+    });
+  }
+
+  Future<void> _saveTrackingInterval(int value) async {
+    SharedPreferences prefs = await SharedPreferences.getInstance();
+    await prefs.setInt('trackingInterval', value);
+    setState(() {
+      _trackingInterval = value;
+    });
+  }
 
   Future<String> _getSaveDir() async {
     SharedPreferences prefs = await SharedPreferences.getInstance();
-
     final String saveDir = prefs.getString('saveDir') ?? "";
-
     return saveDir;
   }
 
-
-
   @override
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(title: Text(AppLocalizations.of(context)!.settings),),
-      body: Center(
+      body: Padding(
+        padding: const EdgeInsets.all(16.0),
         child: Column(
+          crossAxisAlignment: CrossAxisAlignment.start,
           children: [
             Text(AppLocalizations.of(context)!.filelocation, style: const TextStyle(fontSize: 20),),
-            FutureBuilder(future: _getSaveDir(), builder: (context, snapshot) {
-              if (snapshot.connectionState == ConnectionState.done) {
-                return Text(snapshot.data ?? "");
-              } else {
-                return const CircularProgressIndicator();
+            FutureBuilder(
+              future: _getSaveDir(), 
+              builder: (context, snapshot) {
+                if (snapshot.connectionState == ConnectionState.done) {
+                  return Text(snapshot.data ?? "");
+                } else {
+                  return const CircularProgressIndicator();
+                }
               }
-            }),
-            ElevatedButton(onPressed: () {
-              
-            }, child: Text(AppLocalizations.of(context)!.open))
+            ),
+            ElevatedButton(
+              onPressed: () {}, 
+              child: Text(AppLocalizations.of(context)!.open)
+            ),
+            const SizedBox(height: 24),
+            const Text(
+              'Tracking Interval (Sekunden)',
+              style: TextStyle(fontSize: 20),
+            ),
+            Slider(
+              value: _trackingInterval.toDouble(),
+              min: 10,
+              max: 300,
+              divisions: 29,
+              label: _trackingInterval.toString(),
+              onChanged: (double value) {
+                _saveTrackingInterval(value.round());
+              },
+            ),
+            Text('Aktuelles Intervall: $_trackingInterval Sekunden'),
           ],
         ),
       ),