feat: overall UI rework in Settings View (#53)

lib/ui/widgets/shared/application_item.dart

@@ -41,7 +41,7 @@ class ApplicationItem extends StatelessWidget {
         ),
         padding: const EdgeInsets.symmetric(horizontal: 10.0, vertical: 12.0),
         child: Row(
-          children: [
+          children: <Widget>[
             SizedBox(
               width: 60,
               child: Image.memory(
@@ -55,7 +55,7 @@ class ApplicationItem extends StatelessWidget {
               width: MediaQuery.of(context).size.width - 250,
               child: Column(
                 crossAxisAlignment: CrossAxisAlignment.start,
-                children: [
+                children: <Widget>[
                   Text(
                     name,
                     style: GoogleFonts.roboto(
@@ -93,7 +93,7 @@ class ApplicationItem extends StatelessWidget {
         padding: const EdgeInsets.symmetric(vertical: 8.0, horizontal: 16.0),
         child: Column(
           crossAxisAlignment: CrossAxisAlignment.start,
-          children: [
+          children: <Widget>[
             I18nText(
               'applicationItem.changelogLabel',
               child: Text(

lib/ui/widgets/shared/custom_sliver_app_bar.dart

@@ -0,0 +1,39 @@
+import 'package:flutter/material.dart';
+import 'package:revanced_manager/theme.dart';
+
+class CustomSliverAppBar extends StatelessWidget {
+  final Widget title;
+  final PreferredSizeWidget? bottom;
+
+  const CustomSliverAppBar({
+    Key? key,
+    required this.title,
+    this.bottom,
+  }) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return SliverAppBar(
+      pinned: true,
+      snap: false,
+      floating: false,
+      expandedHeight: 100.0,
+      automaticallyImplyLeading: false,
+      backgroundColor: MaterialStateColor.resolveWith(
+        (states) => states.contains(MaterialState.scrolledUnder)
+            ? isDark
+                ? Theme.of(context).colorScheme.primary
+                : Theme.of(context).navigationBarTheme.backgroundColor!
+            : Theme.of(context).scaffoldBackgroundColor,
+      ),
+      flexibleSpace: FlexibleSpaceBar(
+        titlePadding: const EdgeInsets.symmetric(
+          vertical: 23.0,
+          horizontal: 20.0,
+        ),
+        title: title,
+      ),
+      bottom: bottom,
+    );
+  }
+}

lib/ui/widgets/shared/search_bar.dart

@@ -44,7 +44,7 @@ class _SearchBarState extends State<SearchBar> {
         ),
       ),
       child: Row(
-        children: [
+        children: <Widget>[
           Expanded(
             child: TextFormField(
               onChanged: widget.onQueryChanged,