fix(deps): update nextjs monorepo to v16

src/client/package.json

@@ -12,13 +12,13 @@
     "@reduxjs/toolkit": "2.6.0",
     "@tippyjs/react": "4.2.6",
     "axios": "1.8.1",
-    "next": "15.2.1",
+    "next": "16.0.7",
     "next-pwa": "5.6.0",
     "react": "19.0.0",
     "react-dom": "19.0.0",
     "react-redux": "9.2.0",
     "react-textarea-autosize": "8.5.7",
-    "tailwindcss": "4.1.17"
+    "tailwindcss": "4.0.10"
   },
   "devDependencies": {
     "@types/react": "19.0.10",
@@ -26,7 +26,7 @@
     "autoprefixer": "10.4.20",
     "cssnano": "7.0.6",
     "eslint": "9.21.0",
-    "eslint-config-next": "15.2.1",
+    "eslint-config-next": "16.0.7",
     "postcss": "8.5.3",
     "postcss-import": "16.1.0",
     "prettier": "3.5.3",