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/issue/IssuePredicate.js

@@ -0,0 +1,10 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+function createTrivialIssuePredicate(result) {
+    return () => result;
+}
+exports.createTrivialIssuePredicate = createTrivialIssuePredicate;
+function composeIssuePredicates(predicates) {
+    return (issue) => predicates.some((predicate) => predicate(issue));
+}
+exports.composeIssuePredicates = composeIssuePredicates;