fix: 二级评论点击报错、一些样式修改

lib/common/widgets/custom_toast.dart

@@ -8,17 +8,19 @@ class CustomToast extends StatelessWidget {
   Widget build(BuildContext context) {
     return Container(
       margin:
-          EdgeInsets.only(bottom: MediaQuery.of(context).padding.bottom + 20),
+          EdgeInsets.only(bottom: MediaQuery.of(context).padding.bottom + 30),
       padding: const EdgeInsets.symmetric(horizontal: 17, vertical: 10),
       decoration: BoxDecoration(
         color: Theme.of(context).colorScheme.primaryContainer,
         borderRadius: BorderRadius.circular(20),
       ),
-      child: Text(msg,
-          style: Theme.of(context)
-              .textTheme
-              .labelMedium!
-              .copyWith(color: Theme.of(context).colorScheme.primary)),
+      child: Text(
+        msg,
+        style: TextStyle(
+          fontSize: 13,
+          color: Theme.of(context).colorScheme.primary,
+        ),
+      ),
     );
   }
 }

lib/common/widgets/network_img_layer.dart

@@ -58,7 +58,8 @@ class NetworkImgLayer extends StatelessWidget {
   }
 
   Widget placeholder(context) {
-    return SizedBox(
+    return Container(
+      color: Theme.of(context).colorScheme.onInverseSurface.withOpacity(0.6),
       width: width ?? double.infinity,
       height: height ?? double.infinity,
       child: Center(