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/cosmiconfig/dist/Explorer.d.ts

@@ -0,0 +1,14 @@
+import { ExplorerBase } from './ExplorerBase';
+import { CosmiconfigResult, ExplorerOptions } from './types';
+declare class Explorer extends ExplorerBase<ExplorerOptions> {
+    constructor(options: ExplorerOptions);
+    search(searchFrom?: string): Promise<CosmiconfigResult>;
+    private searchFromDirectory;
+    private searchDirectory;
+    private loadSearchPlace;
+    private loadFileContent;
+    private createCosmiconfigResult;
+    load(filepath: string): Promise<CosmiconfigResult>;
+}
+export { Explorer };
+//# sourceMappingURL=Explorer.d.ts.map