Add code-blocks support

src/backend/models/block.go

@@ -13,6 +13,7 @@ import (
 type BlockType string
 
 const (
+	CodeBlock           BlockType = "code"
 	TextBlock           BlockType = "text"
 	TaskBlock           BlockType = "task"
 	HeadingBlock        BlockType = "header"

src/frontend/lib/utils/attributed_text_utils.dart

@@ -33,6 +33,7 @@ class AttributedTextUtils {
 
     // Use the same attribution types that SuperEditor uses in defaultStyleBuilder
     final attributions = [
+      const NamedAttribution('code'),
       const NamedAttribution('bold'),
       const NamedAttribution('italics'),
       const NamedAttribution('underline'),
@@ -157,6 +158,7 @@ class AttributedTextUtils {
               if (start >= 0 && end > start && end <= text.length) {
                 // Apply attributions based on the type
                 switch (type) {
+                  case 'code':
                   case 'bold':
                   case 'italics':
                   case 'underline':

src/frontend/lib/utils/document_builder.dart

@@ -626,6 +626,8 @@ class DocumentBuilder {
         final levelStr = blockTypeStr.substring(6);
         final level = int.tryParse(levelStr) ?? 1;
         metadata['level'] = level;
+      } else if (blockType == 'code') {
+        metadata['code-block'] = node.metadata['code-block'] ?? 'plain';
       }
     } else if (node is TaskNode) {
       content['text'] = node.text.toPlainText();
@@ -685,6 +687,8 @@ class DocumentBuilder {
         blockType = 'header';
         final levelStr = blockType.substring(6);
         metadata['level'] = DataConverter.parseIntSafely(levelStr);
+      } else if (blockType == 'code') {
+        metadata['code-block'] = node.metadata['code-block'] ?? 'plain';
       }
     } else if (node is TaskNode) {
       content['text'] = node.text.toPlainText();
@@ -699,11 +703,11 @@ class DocumentBuilder {
 
       // Extract spans for list items
       final spans =
-          _attributedTextUtils.extractSpansFromAttributedText(node.text);
+        _attributedTextUtils.extractSpansFromAttributedText(node.text);
       metadata['spans'] = spans;
 
       metadata['listType'] =
-          node.type == ListItemType.ordered ? 'ordered' : 'unordered';
+        node.type == ListItemType.ordered ? 'ordered' : 'unordered';
     }
 
     return {'content': content, 'metadata': metadata};
@@ -767,7 +771,29 @@ class DocumentBuilder {
         return [
           HorizontalRuleNode(
             id: Editor.createNodeId(),
-            // metadata: metadata
+          ),
+        ];
+
+      case 'code':
+        final language = metadata != null
+            ? metadata['code-block']?.toString() ?? 'plain'
+            : 'plain';
+        return [
+          ParagraphNode(
+            id: Editor.createNodeId(),
+            text: _attributedTextUtils
+                .createAttributedTextFromContent(text, {'metadata': metadata}),
+            metadata: {
+              'blockType': const NamedAttribution("code"),
+              'code-block': language,
+              'spans': [
+                {
+                  'start': 1,
+                  'end': text.length,
+                  'type': 'code',
+                },
+              ],
+            },
           ),
         ];