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/fork-ts-checker-webpack-plugin/lib/watch/InclusiveNodeWatchFileSystem.d.ts

@@ -0,0 +1,15 @@
+import { ForkTsCheckerWebpackPluginState } from '../ForkTsCheckerWebpackPluginState';
+import { FSWatcher } from 'chokidar';
+import { Watcher, WatchFileSystem, WatchFileSystemOptions } from './WatchFileSystem';
+import { Compiler } from 'webpack';
+declare class InclusiveNodeWatchFileSystem implements WatchFileSystem {
+    private watchFileSystem;
+    private compiler;
+    private pluginState;
+    get watcher(): import("./WatchFileSystem").Watchpack;
+    readonly dirsWatchers: Map<string, FSWatcher | undefined>;
+    constructor(watchFileSystem: WatchFileSystem, compiler: Compiler, pluginState: ForkTsCheckerWebpackPluginState);
+    private paused;
+    watch(files: Iterable<string>, dirs: Iterable<string>, missing: Iterable<string>, startTime?: number, options?: Partial<WatchFileSystemOptions>, callback?: Function, callbackUndelayed?: Function): Watcher;
+}
+export { InclusiveNodeWatchFileSystem };