content: remove repetition of code block container

Introduces _CodeBlockContainer

Author: rajveermalviya

lib/widgets/content.dart

@@ -252,23 +252,21 @@ Widget _buildCodeBlock({
   required CodeBlockNode node,
 }) {
   if (node.spans.isEmpty) {
-    return const CodeBlock(text: '');
+    return const CodeBlockBasic(text: '');
   } else if (node.spans.length == 1 && node.spans.first.className == ''){
-    return CodeBlock(text: node.spans.first.text);
+    return CodeBlockBasic(text: node.spans.first.text);
   } else {
     return CodeBlockHighlighted(node: node);
   }
 }
 
-class CodeBlock extends StatelessWidget {
-  const CodeBlock({super.key, required this.text});
-
-  final String text;
+class _CodeBlockContainer extends StatelessWidget {
+  const _CodeBlockContainer({super.key, required this.child});
+  final Widget child;
 
   @override
   Widget build(BuildContext context) {
     return Container(
-      padding: const EdgeInsets.fromLTRB(7, 5, 7, 3),
       decoration: BoxDecoration(
         color: Colors.white,
         border: Border.all(
@@ -277,7 +275,20 @@ class CodeBlock extends StatelessWidget {
         borderRadius: BorderRadius.circular(4)),
       child: SingleChildScrollViewWithScrollbar(
         scrollDirection: Axis.horizontal,
-        child: Text(text, style: _kCodeBlockStyle)));
+        child: Padding(
+          padding: const EdgeInsets.fromLTRB(7, 5, 7, 3),
+          child: child)));
+  }
+}
+
+class CodeBlockBasic extends StatelessWidget {
+  const CodeBlockBasic({super.key, required this.text});
+
+  final String text;
+
+  @override
+  Widget build(BuildContext context) {
+    return _CodeBlockContainer(child: Text(text, style: _kCodeBlockStyle));
   }
 }
 
@@ -291,17 +302,7 @@ class CodeBlockHighlighted extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    return Container(
-      padding: const EdgeInsets.fromLTRB(7, 5, 7, 3),
-      decoration: BoxDecoration(
-        color: Colors.white,
-        border: Border.all(
-          width: 1,
-          color: const HSLColor.fromAHSL(0.15, 0, 0, 0).toColor()),
-        borderRadius: BorderRadius.circular(4)),
-      child: SingleChildScrollViewWithScrollbar(
-        scrollDirection: Axis.horizontal,
-        child: Text.rich(_builder.build())));
+    return _CodeBlockContainer(child: Text.rich(_builder.build()));
   }
 }