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-reduce-initial/src/data/toInitial.json

@@ -0,0 +1,36 @@
+{
+  "background-clip": "border-box",
+  "background-color": "transparent",
+  "background-origin": "padding-box",
+  "background-size": "auto auto",
+  "border-block-color": "currentcolor",
+  "border-block-end-color": "currentcolor",
+  "border-block-start-color": "currentcolor",
+  "border-bottom-color": "currentcolor",
+  "border-collapse": "separate",
+  "border-inline-color": "currentcolor",
+  "border-inline-end-color": "currentcolor",
+  "border-inline-start-color": "currentcolor",
+  "border-left-color": "currentcolor",
+  "border-right-color": "currentcolor",
+  "border-top-color": "currentcolor",
+  "box-sizing": "content-box",
+  "color": "canvastext",
+  "column-rule-color": "currentcolor",
+  "font-synthesis": "weight style",
+  "image-orientation": "from-image",
+  "mask-clip": "border-box",
+  "mask-mode": "match-source",
+  "mask-origin": "border-box",
+  "mask-type": "luminance",
+  "ruby-align": "space-around",
+  "ruby-merge": "separate",
+  "ruby-position": "alternate",
+  "text-decoration-color": "currentcolor",
+  "text-emphasis-color": "currentcolor",
+  "text-emphasis-position": "over right",
+  "transform-box": "view-box",
+  "transform-origin": "50% 50% 0",
+  "vertical-align": "baseline",
+  "writing-mode": "horizontal-tb"
+}