Add missing TextNode component

frontend/src/components/TextNode.jsx

@@ -0,0 +1,78 @@
+import { useRef, useEffect } from 'react';
+import { Handle, Position } from 'reactflow';
+import ReactQuill from 'react-quill-new';
+import 'react-quill-new/dist/quill.snow.css';
+import '../styles/quill-dark.css';
+
+function TextNode({ data }) {
+  const quillRef = useRef(null);
+
+  useEffect(() => {
+    const editor = quillRef.current?.getEditor?.();
+    const editorRoot = editor?.root;
+
+    if (editorRoot) {
+      const stopKey = (e) => {
+        // fix for spacebar and prevent ReactFlow stealing key
+        if (e.key === ' ' || e.key === 'ArrowLeft' || e.key === 'ArrowRight') {
+          e.stopPropagation();
+        }
+      };
+      editorRoot.addEventListener('keydown', stopKey);
+      return () => {
+        editorRoot.removeEventListener('keydown', stopKey);
+      };
+    }
+  }, [data.editing]); // reapply listener only when editing mode is toggled
+
+  return (
+    <div
+      style={{
+        padding: 10,
+        borderRadius: 6,
+        background: '#1f1f1f',
+        border: '1px solid #1f1f1f',
+        minWidth: 150,
+        maxWidth: 300,
+        overflowWrap: 'break-word',
+        whiteSpace: 'normal',
+      }}
+    >
+      <Handle type="target" position={Position.Top} />
+
+      {data.editing ? (
+        <div
+          onPointerDown={(e) => e.stopPropagation()}
+          onMouseDown={(e) => e.stopPropagation()}
+          onClick={(e) => e.stopPropagation()}
+          onDoubleClick={(e) => e.stopPropagation()}
+        >
+          <ReactQuill
+            ref={quillRef}
+            value={data.value}
+            onChange={data.onChange}
+            theme="snow"
+            style={{ background: '#1f1f1f', color: 'white', borderRadius: 6 }}
+          />
+          <button
+            className="btn"
+            style={{ marginTop: 8, padding: '4px 10px', fontSize: 12, borderRadius: 6 }}
+            onClick={data.onSave}
+          >
+            ✅ Save
+          </button>
+        </div>
+      ) : (
+        <div
+          dangerouslySetInnerHTML={{
+            __html: data.value || '<i>Double-click to edit...</i>',
+          }}
+        />
+      )}
+
+      <Handle type="source" position={Position.Bottom} />
+    </div>
+  );
+}
+
+export default TextNode;