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/postcss-selector-parser/dist/selectors/index.js

@@ -0,0 +1,21 @@
+"use strict";
+
+exports.__esModule = true;
+var _types = require("./types");
+Object.keys(_types).forEach(function (key) {
+  if (key === "default" || key === "__esModule") return;
+  if (key in exports && exports[key] === _types[key]) return;
+  exports[key] = _types[key];
+});
+var _constructors = require("./constructors");
+Object.keys(_constructors).forEach(function (key) {
+  if (key === "default" || key === "__esModule") return;
+  if (key in exports && exports[key] === _constructors[key]) return;
+  exports[key] = _constructors[key];
+});
+var _guards = require("./guards");
+Object.keys(_guards).forEach(function (key) {
+  if (key === "default" || key === "__esModule") return;
+  if (key in exports && exports[key] === _guards[key]) return;
+  exports[key] = _guards[key];
+});