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-strategies/index.d.ts

@@ -0,0 +1,20 @@
+import { CacheFirst } from './CacheFirst.js';
+import { CacheOnly } from './CacheOnly.js';
+import { NetworkFirst, NetworkFirstOptions } from './NetworkFirst.js';
+import { NetworkOnly, NetworkOnlyOptions } from './NetworkOnly.js';
+import { StaleWhileRevalidate } from './StaleWhileRevalidate.js';
+import { Strategy, StrategyOptions } from './Strategy.js';
+import { StrategyHandler } from './StrategyHandler.js';
+import './_version.js';
+declare global {
+    interface FetchEvent {
+        readonly preloadResponse: Promise<any>;
+    }
+}
+/**
+ * There are common caching strategies that most service workers will need
+ * and use. This module provides simple implementations of these strategies.
+ *
+ * @module workbox-strategies
+ */
+export { CacheFirst, CacheOnly, NetworkFirst, NetworkFirstOptions, NetworkOnly, NetworkOnlyOptions, StaleWhileRevalidate, Strategy, StrategyHandler, StrategyOptions, };