squash! chore: fix some linter warnings

lib/main.dart

@@ -61,8 +61,8 @@ class _MyHomePageState extends State<MyHomePage> {
   }
 
   // TODO :find a better way to show the list
-  void showResult(Future<List<Station>> future_id) async {
-    stationList = await future_id;
+  void showResult(Future<List<Station>> futureId) async {
+    stationList = await futureId;
     id = stationList[0].id;
     setState(() {});
   }

lib/transport_helper.dart

@@ -2,7 +2,6 @@ import 'package:sqflite/sqflite.dart';
 // import './state_helper.dart';
 // import './db_helper.dart';
 
-// TODO: get access to DB
 
 class DbHelper {
   static late Database db;
@@ -106,7 +105,6 @@ class Journey {
   }
 
   // from trip API request
-  // TODO: how to connect this best with the database for read/write?
   factory Journey.fromJson(Map<String, dynamic> json) {
     Journey newJourney = Journey(
       segments: json["LegList"]["Leg"].map((leg) => Segment.fromJson(leg)),
@@ -558,7 +556,6 @@ class Station {
         .toList();
   }
 
-  //TODO: usage
   factory Station.fromMap(
     Map<String, Object?> map, {
     List<Line>? stationLines,