improve performance & ui

lib/components/comic.dart

@@ -43,7 +43,7 @@ class ComicTile extends StatelessWidget {
     var renderBox = context.findRenderObject() as RenderBox;
     var size = renderBox.size;
     var location = renderBox.localToGlobal(
-      Offset(size.width / 2, size.height / 2),
+      Offset((size.width - 242) / 2, size.height / 2),
     );
     showMenu(location, context);
   }

lib/components/loading.dart

@@ -96,6 +96,20 @@ class ListLoadingIndicator extends StatelessWidget {
   }
 }
 
+class SliverListLoadingIndicator extends StatelessWidget {
+  const SliverListLoadingIndicator({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    // SliverToBoxAdapter can not been lazy loaded.
+    // Use SliverList to make sure the animation can be lazy loaded.
+    return SliverList.list(children: const [
+      SizedBox(),
+      ListLoadingIndicator(),
+    ]);
+  }
+}
+
 abstract class LoadingState<T extends StatefulWidget, S extends Object>
     extends State<T> {
   bool isLoading = false;
@@ -299,9 +313,7 @@ abstract class MultiPageLoadingState<T extends StatefulWidget, S extends Object>
 
   Widget buildLoading(BuildContext context) {
     return Center(
-      child: const CircularProgressIndicator(
-        strokeWidth: 2,
-      ).fixWidth(32).fixHeight(32),
+      child: const CircularProgressIndicator().fixWidth(32).fixHeight(32),
     );
   }
 

lib/components/menu.dart

@@ -42,6 +42,9 @@ class _MenuRoute<T> extends PopupRoute<T> {
           child: Container(
             decoration: BoxDecoration(
               borderRadius: BorderRadius.circular(4),
+              border: context.brightness == Brightness.dark
+                  ? Border.all(color: context.colorScheme.outlineVariant)
+                  : null,
               boxShadow: [
                 BoxShadow(
                   color: context.colorScheme.shadow.withOpacity(0.2),
@@ -51,10 +54,10 @@ class _MenuRoute<T> extends PopupRoute<T> {
               ],
             ),
             child: BlurEffect(
-              borderRadius: BorderRadius.circular(8),
+              borderRadius: BorderRadius.circular(4),
               child: Material(
-                color: context.colorScheme.surface.withOpacity(0.82),
-                borderRadius: BorderRadius.circular(8),
+                color: context.colorScheme.surface.withOpacity(0.78),
+                borderRadius: BorderRadius.circular(4),
                 child: Container(
                   width: width,
                   padding: