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/lucide-react/dist/esm/icons/case-upper.mjs

@@ -0,0 +1,17 @@
+/**
+ * lucide-react v0.0.1 - ISC
+ */
+
+import createLucideIcon from '../createLucideIcon.mjs';
+
+const CaseUpper = createLucideIcon("CaseUpper", [
+  ["path", { d: "m3 15 4-8 4 8", key: "1vwr6u" }],
+  ["path", { d: "M4 13h6", key: "1r9ots" }],
+  [
+    "path",
+    { d: "M15 11h4.5a2 2 0 0 1 0 4H15V7h4a2 2 0 0 1 0 4", key: "1sqfas" }
+  ]
+]);
+
+export { CaseUpper as default };
+//# sourceMappingURL=case-upper.mjs.map