Update flutter

lib/components/flashcard.dart

@@ -1,7 +1,7 @@
 import 'dart:math';
 
 import 'package:flutter/material.dart';
-import 'package:tangocard_reader/models/data_entry.dart';
+import 'package:yokutango_mobile_reader/models/data_entry.dart';
 
 class Flashcard extends StatelessWidget {
   final YokutangoEntry? card;
@@ -18,8 +18,8 @@ class Flashcard extends StatelessWidget {
     this.languageFlipped = false,
     this.amountOfCardsOnStack = 10,
     this.rotationAmount = pi / 18,
-    Key? key,
-  }) : super(key: key);
+    super.key,
+  });
 
   @override
   Widget build(BuildContext context) {
@@ -46,8 +46,8 @@ class Flashcard extends StatelessWidget {
     }
 
     stackItems.add(_FlashCardPaper(
-      child: content,
       cardIndex: cardIndex,
+      child: content,
     ));
 
     return Center(
@@ -87,8 +87,8 @@ class _FlashCardPaper extends StatelessWidget {
   const _FlashCardPaper({
     this.child,
     this.cardIndex,
-    Key? key,
-  }) : super(key: key);
+    super.key,
+  });
 
   @override
   Widget build(BuildContext context) {
@@ -134,8 +134,8 @@ class _NorwegianContent extends StatelessWidget {
 
   const _NorwegianContent({
     required this.card,
-    Key? key,
-  }) : super(key: key);
+    super.key,
+  });
 
   @override
   Widget build(BuildContext context) {
@@ -169,8 +169,8 @@ class _JapaneseContent extends StatelessWidget {
 
   const _JapaneseContent({
     required this.card,
-    Key? key,
-  }) : super(key: key);
+    super.key,
+  });
 
   @override
   Widget build(BuildContext context) {

lib/components/navigation_buttons.dart

@@ -7,12 +7,12 @@ class NavigationButtons extends StatelessWidget {
   final void Function()? onMiddlePressed;
 
   const NavigationButtons({
-    Key? key,
+    super.key,
     required this.middleText,
     required this.onNextCard,
     required this.onPreviousCard,
     this.onMiddlePressed,
-  }) : super(key: key);
+  });
 
   @override
   Widget build(BuildContext context) =>
@@ -39,7 +39,7 @@ class NavigationButtons extends StatelessWidget {
                       middleText,
                       style: Theme.of(context)
                           .textTheme
-                          .headline6!
+                          .headlineSmall!
                           .merge(const TextStyle(color: Colors.white)),
                     ),
                   ),