fixed project problems (warnings)

refilc_desktop_ui/lib/common/filter_bar.dart

@@ -3,15 +3,14 @@ import 'package:flutter/material.dart';
 
 class FilterBar extends StatelessWidget implements PreferredSizeWidget {
   const FilterBar({
-    Key? key,
+    super.key,
     required this.items,
     required this.controller,
     this.onTap,
     this.padding = const EdgeInsets.symmetric(horizontal: 24.0),
     this.disableFading = false,
     this.scrollable = true,
-  })  : assert(items.length == controller.length),
-        super(key: key);
+  })  : assert(items.length == controller.length);
 
   final List<Widget> items;
   final TabController controller;

refilc_desktop_ui/lib/common/panel_button.dart

@@ -3,14 +3,14 @@ import 'package:flutter/material.dart';
 
 class PanelButton extends StatelessWidget {
   const PanelButton({
-    Key? key,
+    super.key,
     this.onPressed,
     this.padding = const EdgeInsets.symmetric(horizontal: 14.0),
     this.leading,
     this.title,
     this.trailing,
     this.trailingDivider = false,
-  }) : super(key: key);
+  });
 
   final void Function()? onPressed;
   final EdgeInsetsGeometry padding;

refilc_desktop_ui/lib/common/profile_image.dart

@@ -5,12 +5,12 @@ import 'package:refilc/theme/colors/colors.dart';
 
 class ProfileImage extends StatelessWidget {
   const ProfileImage({
-    Key? key,
+    super.key,
     this.name,
     this.radius = 20.0,
     this.role = Role.student,
     this.backgroundColor,
-  }) : super(key: key);
+  });
 
   final String? name;
   final double radius;

refilc_desktop_ui/lib/common/widgets/grade/grade_viewable.dart

@@ -3,7 +3,7 @@ import 'package:refilc_kreta_api/models/grade.dart';
 import 'package:refilc/ui/widgets/grade/grade_tile.dart';
 
 class GradeViewable extends StatelessWidget {
-  const GradeViewable(this.grade, {Key? key}) : super(key: key);
+  const GradeViewable(this.grade, {super.key});
 
   final Grade grade;
 

refilc_desktop_ui/lib/common/widgets/lesson/lesson_viewable.dart

@@ -3,8 +3,7 @@ import 'package:refilc/ui/widgets/lesson/lesson_tile.dart';
 import 'package:flutter/material.dart';
 
 class LessonViewable extends StatelessWidget {
-  const LessonViewable(this.lesson, {Key? key, this.swapDesc = false})
-      : super(key: key);
+  const LessonViewable(this.lesson, {super.key, this.swapDesc = false});
 
   final Lesson lesson;
   final bool swapDesc;