chore: Update to Next.js 16 and latest dependencies

Major updates:
- next: 15.1.3 -> 16.0.0
- next-auth: 4.24.8 -> 5.0.0-beta.25 (Next-Auth v5 for Next.js 16)
- react: 19.0.0 -> 19.1.0
- react-dom: 19.0.0 -> 19.1.0

Other updates:
- recharts: 2.15.0 -> 2.16.0
- lucide-react: 0.474.0 -> 0.475.0
- date-fns: 4.1.0 -> 4.2.0
- @radix-ui/*: Updated to latest
- tailwindcss: 3.4.17 -> 3.4.18
- typescript: 5.7.2 -> 5.8.0

frontend/package.json

@@ -8,29 +8,29 @@
     "lint": "next lint"
   },
   "dependencies": {
-    "next": "15.1.3",
-    "next-auth": "^4.24.8",
-    "react": "^19.0.0",
-    "react-dom": "^19.0.0",
-    "recharts": "^2.15.0",
-    "lucide-react": "^0.474.0",
-    "date-fns": "^4.1.0",
-    "@radix-ui/react-dialog": "^1.1.2",
-    "@radix-ui/react-dropdown-menu": "^2.1.4",
-    "@radix-ui/react-slot": "^1.1.1",
-    "@radix-ui/react-tabs": "^1.1.1",
-    "@radix-ui/react-toast": "^1.2.5",
-    "class-variance-authority": "^0.7.1",
-    "clsx": "^2.1.1",
-    "tailwind-merge": "^2.6.0"
+    "next": "16.0.0",
+    "next-auth": "^5.0.0-beta.25",
+    "react": "^19.1.0",
+    "react-dom": "^19.1.0",
+    "recharts": "^2.16.0",
+    "lucide-react": "^0.475.0",
+    "date-fns": "^4.2.0",
+    "@radix-ui/react-dialog": "^1.1.3",
+    "@radix-ui/react-dropdown-menu": "^2.1.5",
+    "@radix-ui/react-slot": "^1.1.2",
+    "@radix-ui/react-tabs": "^1.1.2",
+    "@radix-ui/react-toast": "^1.2.6",
+    "class-variance-authority": "^0.7.2",
+    "clsx": "^2.1.2",
+    "tailwind-merge": "^2.7.0"
   },
   "devDependencies": {
-    "@types/node": "^22.10.2",
-    "@types/react": "^19.0.6",
-    "@types/react-dom": "^19.0.2",
-    "typescript": "^5.7.2",
-    "tailwindcss": "^3.4.17",
-    "postcss": "^8.4.49",
-    "autoprefixer": "^10.4.20"
+    "@types/node": "^22.12.0",
+    "@types/react": "^19.1.0",
+    "@types/react-dom": "^19.1.1",
+    "typescript": "^5.8.0",
+    "tailwindcss": "^3.4.18",
+    "postcss": "^8.4.50",
+    "autoprefixer": "^10.4.21"
   }
 }