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-recipes/googleFontsCache.d.ts

@@ -0,0 +1,18 @@
+import './_version.js';
+export interface GoogleFontCacheOptions {
+    cachePrefix?: string;
+    maxAgeSeconds?: number;
+    maxEntries?: number;
+}
+/**
+ * An implementation of the [Google fonts]{@link https://developers.google.com/web/tools/workbox/guides/common-recipes#google_fonts} caching recipe
+ *
+ * @memberof workbox-recipes
+ *
+ * @param {Object} [options]
+ * @param {string} [options.cachePrefix] Cache prefix for caching stylesheets and webfonts. Defaults to google-fonts
+ * @param {number} [options.maxAgeSeconds] Maximum age, in seconds, that font entries will be cached for. Defaults to 1 year
+ * @param {number} [options.maxEntries] Maximum number of fonts that will be cached. Defaults to 30
+ */
+declare function googleFontsCache(options?: GoogleFontCacheOptions): void;
+export { googleFontsCache };