opt.: upgrade linter & fix lint issues

lib/view/widget/cardx.dart

@@ -1,7 +1,7 @@
 import 'package:flutter/material.dart';
 
 class CardX extends StatelessWidget {
-  const CardX(this.child, {Key? key, this.color}) : super(key: key);
+  const CardX(this.child, {super.key, this.color});
 
   final Widget child;
   final Color? color;

lib/view/widget/choice_chip.dart

@@ -3,11 +3,11 @@ import 'package:flutter/material.dart';
 
 class ChoiceChipX<T> extends StatelessWidget {
   const ChoiceChipX({
-    Key? key,
+    super.key,
     required this.label,
     required this.state,
     required this.value,
-  }) : super(key: key);
+  });
 
   final String label;
   final ChoiceController<T> state;

lib/view/widget/fade_in.dart

@@ -6,10 +6,10 @@ class FadeIn extends StatefulWidget {
   final Duration duration;
 
   const FadeIn({
-    Key? key,
+    super.key,
     required this.child,
     this.duration = const Duration(milliseconds: 477),
-  }) : super(key: key);
+  });
 
   @override
   _MyFadeInState createState() => _MyFadeInState();

lib/view/widget/omit_start_text.dart

@@ -8,11 +8,11 @@ class OmitStartText extends StatelessWidget {
 
   const OmitStartText(
     this.text, {
-    Key? key,
+    super.key,
     this.maxLines,
     this.style,
     this.overflow,
-  }) : super(key: key);
+  });
 
   @override
   Widget build(BuildContext context) {

lib/view/widget/tag.dart

@@ -184,13 +184,13 @@ class TagSwitcher extends StatelessWidget {
   final String all;
 
   const TagSwitcher({
-    Key? key,
+    super.key,
     required this.tags,
     required this.width,
     required this.onTagChanged,
     required this.all,
     this.initTag,
-  }) : super(key: key);
+  });
 
   @override
   Widget build(BuildContext context) {

lib/view/widget/two_line_text.dart

@@ -2,8 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:toolbox/data/res/ui.dart';
 
 class TwoLineText extends StatelessWidget {
-  const TwoLineText({Key? key, required this.up, required this.down})
-      : super(key: key);
+  const TwoLineText({super.key, required this.up, required this.down});
   final String up;
   final String down;
 

lib/view/widget/url_text.dart

@@ -14,12 +14,12 @@ class UrlText extends StatelessWidget {
   final TextStyle style;
 
   const UrlText({
-    Key? key,
+    super.key,
     required this.text,
     this.replace,
     this.textAlign,
     this.style = const TextStyle(),
-  }) : super(key: key);
+  });
 
   List<InlineSpan> _buildTextSpans(Color c) {
     final widgets = <InlineSpan>[];
@@ -69,9 +69,8 @@ class UrlText extends StatelessWidget {
 }
 
 class _LinkTextSpan extends TextSpan {
-  _LinkTextSpan({TextStyle? style, required String text, String? replace})
+  _LinkTextSpan({super.style, required String text, String? replace})
       : super(
-          style: style,
           text: replace ?? text,
           recognizer: TapGestureRecognizer()
             ..onTap = () {