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/fork-ts-checker-webpack-plugin/lib/rpc/rpc-ipc/ProcessLike.d.ts

@@ -0,0 +1,12 @@
+/**
+ * This interface describes Node.js process that is potentially able to communicate over IPC channel
+ */
+interface ProcessLike {
+    pid?: string | number;
+    send?: (message: any, sendHandle?: any, options?: any, callback?: (error: any) => void) => boolean;
+    on: (event: any, listener: any) => any;
+    off: (event: any, listener?: any) => any;
+    connected?: boolean;
+    disconnect?: () => void;
+}
+export { ProcessLike };