chore: upgrade Next.js to 16, React to 19

- next 15.5.7 -> 16.2.10 (latest stable)
- react/react-dom 18.3.1 -> 19.2.7
- @next/third-parties -> 16.2.10
- remove React 18 pin from overrides (MUI 5.18 / x-7.29 support React 19)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

package.json

@@ -26,7 +26,7 @@
     "@mui/styled-engine": "^5.18.0",
     "@mui/x-charts": "^7.29.1",
     "@mui/x-date-pickers": "^7.29.4",
-    "@next/third-parties": "^15.5.7",
+    "@next/third-parties": "^16.2.10",
     "aos": "^2.3.4",
     "axios": "^1.13.2",
     "date-fns": "^4.1.0",
@@ -40,14 +40,14 @@
     "js-cookie": "^3.0.5",
     "jspdf": "^3.0.4",
     "moment-jalaali": "^0.10.4",
-    "next": "^15.5.7",
+    "next": "^16.2.10",
     "next-themes": "^0.4.6",
     "npm": "^11.7.0",
     "postcss": "^8.5.6",
     "qrcode": "^1.5.4",
     "qrcode.react": "^4.2.0",
-    "react": "^18.3.1",
-    "react-dom": "^18.3.1",
+    "react": "^19.2.7",
+    "react-dom": "^19.2.7",
     "react-easy-crop": "^5.5.6",
     "react-google-map-picker": "^1.2.3",
     "react-images-uploading": "^3.1.7",
@@ -70,9 +70,5 @@
     "jsdom": "^29.1.1",
     "prettier": "^3.7.4",
     "vitest": "^2.1.9"
-  },
-  "overrides": {
-    "react": "^18.3.1",
-    "react-dom": "^18.3.1"
   }
 }