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/prompts/lib/util/figures.js

@@ -0,0 +1,33 @@
+'use strict';	
+
+ const main = {
+  arrowUp: '↑',
+  arrowDown: '↓',
+  arrowLeft: '←',
+  arrowRight: '→',
+  radioOn: '◉',
+  radioOff: '◯',
+  tick: '✔',	
+  cross: '✖',	
+  ellipsis: '…',	
+  pointerSmall: '›',	
+  line: '─',	
+  pointer: '❯'	
+};	
+const win = {
+  arrowUp: main.arrowUp,
+  arrowDown: main.arrowDown,
+  arrowLeft: main.arrowLeft,
+  arrowRight: main.arrowRight,
+  radioOn: '(*)',
+  radioOff: '( )',	
+  tick: '√',	
+  cross: '×',	
+  ellipsis: '...',	
+  pointerSmall: '»',	
+  line: '─',	
+  pointer: '>'	
+};	
+const figures = process.platform === 'win32' ? win : main;	
+
+ module.exports = figures;