feat(ui): add page to show an overview of all journeys

lib/main.dart

@@ -502,4 +502,48 @@ class SegmentList extends StatelessWidget {
       ],
     );
   }
-}
+}
+
+class JourneyOverviewPage extends StatefulWidget {
+  const JourneyOverviewPage({super.key});
+  @override
+  State<JourneyOverviewPage> createState() => _JourneyOverviewPageState();
+}
+
+class _JourneyOverviewPageState extends State<JourneyOverviewPage> {
+  List<Journey> allJourneys = <Journey>[];
+
+  @override
+  initState() async {
+    super.initState();
+    // TODO: implement batch query to get a list (all) of journeys
+    //allJourneys = await Journey.dbGetAll();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: Center(
+        child: JourneyList(journeys: allJourneys),
+      ),
+    );
+  }
+}
+
+class JourneyList extends StatelessWidget {
+  final List<Journey> journeys;
+  const JourneyList({
+    super.key,
+    required this.journeys,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return ListView(
+      children: [
+        for (Journey jour in journeys)
+          ListTile(title: Text('${jour.startStation} to ${jour.endStation}')),
+      ],
+    );
+  }
+}