change a bunch of stuff, seperate tracking for progress, updated custom srs layout

lib/src/screens/add_card_screen.dart

@@ -50,12 +50,20 @@ class _AddCardScreenState extends State<AddCardScreen> {
 
   void _saveCard() {
     if (_formKey.currentState!.validate()) {
+      final srsData = _useInterval
+          ? SrsData(
+              japaneseToEnglishNextReview: DateTime.now(),
+              englishToJapaneseNextReview: DateTime.now(),
+              listeningComprehensionNextReview: DateTime.now(),
+            )
+          : SrsData();
+
       final newItem = CustomKanjiItem(
         characters: _japaneseController.text,
         meaning: _englishController.text,
-        kanji: _kanjiController.text.isNotEmpty ? _kanjiController.text : null,
+        kanji: _kanjiController.text.trim().isNotEmpty ? _kanjiController.text.trim() : null,
         useInterval: _useInterval,
-        nextReview: _useInterval ? DateTime.now() : null,
+        srsData: srsData,
       );
       _deckRepository.addCard(newItem);
       Navigator.of(context).pop();