Initial commit: Developer Tools MVP with visual editor

- Complete React app with 7 developer tools
- JSON Tool with visual structured editor
- Serialize Tool with visual structured editor
- URL, Base64, CSV/JSON, Beautifier, Diff tools
- Responsive navigation with dropdown menu
- Dark/light mode toggle
- Mobile-responsive design with sticky header
- All tools working with copy/paste functionality

node_modules/@pmmmwh/react-refresh-webpack-plugin/client/utils/retry.js

@@ -0,0 +1,23 @@
+function runWithRetry(callback, maxRetries) {
+  function executeWithRetryAndTimeout(currentCount) {
+    try {
+      if (currentCount > maxRetries - 1) {
+        console.warn('[React Refresh] Failed to set up the socket connection.');
+        return;
+      }
+
+      callback();
+    } catch (err) {
+      setTimeout(
+        function () {
+          executeWithRetryAndTimeout(currentCount + 1);
+        },
+        Math.pow(10, currentCount)
+      );
+    }
+  }
+
+  executeWithRetryAndTimeout(0);
+}
+
+module.exports = runWithRetry;