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/css-declaration-sorter/src/bubble-sort.mjs

@@ -0,0 +1,20 @@
+export function bubbleSort (list, comparator) {
+  let upperIndex = list.length - 1;
+
+  while (upperIndex > 0) {
+    let swapIndex = 0;
+
+    for (let i = 0; i < upperIndex; i += 1) {
+      if (comparator(list[i], list[i + 1]) > 0) {
+        const temp = list[i + 1];
+        list[i + 1] = list[i];
+        list[i] = temp;
+        swapIndex = i;
+      }
+    }
+
+    upperIndex = swapIndex;
+  }
+
+  return list;
+}