fix(mdx): Handle brace counting correctly inside strings for Next-MDX-Remote data props parsing

lib/mdx-utils.ts

@@ -7,14 +7,36 @@ export function fixMdxDataProps(content: string): string {
     let endIndex = -1;
     const startObj = dataIndex + 6; // index of the first '{' in 'data={{'
 
+    let inString = false;
+    let isEscaped = false;
+
     for (let i = startObj; i < fixedContent.length; i++) {
-      if (fixedContent[i] === '{') {
-        openCount++;
-      } else if (fixedContent[i] === '}') {
-        openCount--;
-        if (openCount === 0) {
-          endIndex = i;
-          break;
+      const char = fixedContent[i];
+
+      if (isEscaped) {
+        isEscaped = false;
+        continue;
+      }
+
+      if (char === '\\') {
+        isEscaped = true;
+        continue;
+      }
+
+      if (char === '"') {
+        inString = !inString;
+        continue;
+      }
+
+      if (!inString) {
+        if (char === '{') {
+          openCount++;
+        } else if (char === '}') {
+          openCount--;
+          if (openCount === 0) {
+            endIndex = i;
+            break;
+          }
         }
       }
     }