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/autoprefixer/lib/hacks/text-decoration.js

@@ -0,0 +1,25 @@
+let Declaration = require('../declaration')
+
+const BASIC = [
+  'none',
+  'underline',
+  'overline',
+  'line-through',
+  'blink',
+  'inherit',
+  'initial',
+  'unset'
+]
+
+class TextDecoration extends Declaration {
+  /**
+   * Do not add prefixes for basic values.
+   */
+  check(decl) {
+    return decl.value.split(/\s+/).some(i => !BASIC.includes(i))
+  }
+}
+
+TextDecoration.names = ['text-decoration']
+
+module.exports = TextDecoration