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/workbox-precaching/utils/getCacheKeyForURL.d.ts

@@ -0,0 +1,14 @@
+import { PrecacheRouteOptions } from '../_types.js';
+import '../_version.js';
+/**
+ * This function will take the request URL and manipulate it based on the
+ * configuration options.
+ *
+ * @param {string} url
+ * @param {Object} options
+ * @return {string} Returns the URL in the cache that matches the request,
+ * if possible.
+ *
+ * @private
+ */
+export declare const getCacheKeyForURL: (url: string, options: PrecacheRouteOptions) => string | void;