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-build/build/lib/get-source-map-url.js

@@ -0,0 +1,32 @@
+"use strict";
+/*
+  Copyright 2022 Google LLC
+
+  Use of this source code is governed by an MIT-style
+  license that can be found in the LICENSE file or at
+  https://opensource.org/licenses/MIT.
+*/
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.getSourceMapURL = void 0;
+// Adapted from https://github.com/lydell/source-map-url/blob/master/source-map-url.js
+// See https://github.com/GoogleChrome/workbox/issues/3019
+const innerRegex = /[#@] sourceMappingURL=([^\s'"]*)/;
+const regex = RegExp('(?:' +
+    '/\\*' +
+    '(?:\\s*\r?\n(?://)?)?' +
+    '(?:' +
+    innerRegex.source +
+    ')' +
+    '\\s*' +
+    '\\*/' +
+    '|' +
+    '//(?:' +
+    innerRegex.source +
+    ')' +
+    ')' +
+    '\\s*');
+function getSourceMapURL(srcContents) {
+    const match = srcContents.match(regex);
+    return match ? match[1] || match[2] || '' : null;
+}
+exports.getSourceMapURL = getSourceMapURL;