chore: use some of 'dart analyze's quick fixes and apply formatter

lib/main.dart

@@ -199,6 +199,7 @@ class StationList extends StatelessWidget {
   final ValueChanged<Station> onTapped;
 
   StationList({
+    super.key,
     required this.stationList,
     required this.onTapped,
   });
@@ -298,6 +299,7 @@ class DepartureList extends StatelessWidget {
   final ValueChanged<Departure> onTapped;
 
   const DepartureList({
+    super.key,
     required this.departureList,
     required this.onTapped,
   });
@@ -421,6 +423,7 @@ class ArrivalList extends StatelessWidget {
   final Function onTapped;
 
   const ArrivalList({
+    super.key,
     required this.departure,
     required this.arrivalList,
     required this.onTapped,
@@ -439,4 +442,4 @@ class ArrivalList extends StatelessWidget {
       ],
     );
   }
-}
+}

lib/transport_helper.dart

@@ -2,7 +2,6 @@ import 'package:sqflite/sqflite.dart';
 // import './state_helper.dart';
 // import './db_helper.dart';
 
-
 class DbHelper {
   static late Database db;
   static String dbName = "";
@@ -1103,4 +1102,4 @@ enum VehicleType {
   subway,
   regionalTrain,
   PLACEHOLDER,
-}
+}