Refactor code structure and remove redundant changes

package.json

@@ -4,11 +4,11 @@
   "version": "0.0.0",
   "type": "module",
   "scripts": {
-    "dev": "vite",
-    "build": "vite build",
-    "build:dev": "vite build --mode development",
-    "lint": "eslint .",
-    "preview": "vite preview",
+    "dev": "next dev --turbo",
+    "build": "next build",
+    "start": "next start",
+    "lint": "next lint",
+    "type-check": "tsc --noEmit",
     "test": "vitest",
     "test:ui": "vitest --ui",
     "test:run": "vitest run",
@@ -65,6 +65,7 @@
     "@uppy/xhr-upload": "^5.0.1",
     "@vercel/analytics": "^1.5.0",
     "@vercel/node": "^5.5.2",
+    "axios": "^1.13.2",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
     "cmdk": "^1.1.1",
@@ -74,10 +75,12 @@
     "idb": "^8.0.3",
     "input-otp": "^1.4.2",
     "lucide-react": "^0.462.0",
+    "next": "^16.0.1",
     "next-themes": "^0.3.0",
-    "react": "^18.3.1",
+    "react": "^19.2.0",
     "react-day-picker": "^8.10.1",
-    "react-dom": "^18.3.1",
+    "react-dom": "^19.2.0",
+    "react-helmet-async": "^2.0.5",
     "react-hook-form": "^7.61.1",
     "react-markdown": "^9.1.0",
     "react-resizable-panels": "^2.1.9",