themes and some refractoring

lib/src/screens/home_screen.dart

@@ -3,6 +3,7 @@ import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 import '../models/kanji_item.dart';
+import '../models/srs_item.dart';
 import '../services/deck_repository.dart';
 import '../services/distractor_generator.dart';
 import '../widgets/kanji_card.dart';
@@ -61,9 +62,6 @@ class _HomeScreenState extends State<HomeScreen>
     super.initState();
     _tabController = TabController(length: 3, vsync: this);
     _tabController.addListener(() {
-      if (_tabController.indexIsChanging) {
-        _nextQuestion();
-      }
       setState(() {});
     });
     _dg = widget.distractorGenerator ?? DistractorGenerator();
@@ -266,6 +264,10 @@ class _HomeScreenState extends State<HomeScreen>
           ...distractors.take(3),
         ])..shuffle();
         break;
+      default:
+        // Handle other QuizMode cases if necessary, or throw an error
+        // if these modes are not expected in this context.
+        break;
     }
 
     setState(() {
@@ -294,7 +296,7 @@ class _HomeScreenState extends State<HomeScreen>
     var srsItem = current.srsItems[srsKey];
     final isNew = srsItem == null;
     final srsItemForUpdate = srsItem ??= SrsItem(
-      kanjiId: current.id,
+      subjectId: current.id,
       quizMode: mode,
       readingType: readingType,
     );
@@ -432,6 +434,10 @@ class _HomeScreenState extends State<HomeScreen>
           prompt = quizState.current!.characters;
           subtitle = quizState.readingHint;
           break;
+        default:
+          // Handle other QuizMode cases if necessary, or throw an error
+          // if these modes are not expected in this context.
+          break;
       }
     }