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/PrecacheInstallReportPlugin.d.ts

@@ -0,0 +1,15 @@
+import { WorkboxPlugin } from 'workbox-core/types.js';
+import '../_version.js';
+/**
+ * A plugin, designed to be used with PrecacheController, to determine the
+ * of assets that were updated (or not updated) during the install event.
+ *
+ * @private
+ */
+declare class PrecacheInstallReportPlugin implements WorkboxPlugin {
+    updatedURLs: string[];
+    notUpdatedURLs: string[];
+    handlerWillStart: WorkboxPlugin['handlerWillStart'];
+    cachedResponseWillBeUsed: WorkboxPlugin['cachedResponseWillBeUsed'];
+}
+export { PrecacheInstallReportPlugin };