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/PrecacheCacheKeyPlugin.d.ts

@@ -0,0 +1,17 @@
+import { WorkboxPlugin } from 'workbox-core/types.js';
+import { PrecacheController } from '../PrecacheController.js';
+import '../_version.js';
+/**
+ * A plugin, designed to be used with PrecacheController, to translate URLs into
+ * the corresponding cache key, based on the current revision info.
+ *
+ * @private
+ */
+declare class PrecacheCacheKeyPlugin implements WorkboxPlugin {
+    private readonly _precacheController;
+    constructor({ precacheController }: {
+        precacheController: PrecacheController;
+    });
+    cacheKeyWillBeUsed: WorkboxPlugin['cacheKeyWillBeUsed'];
+}
+export { PrecacheCacheKeyPlugin };