fix(deps): update nextjs monorepo to v16

src/backend/server/src/Todo.Persistence/Todo.Persistence.csproj

@@ -10,7 +10,7 @@
     </ItemGroup>
 
     <ItemGroup>
-        <PackageReference Include="MongoDB.Driver" Version="3.5.1"/>
+        <PackageReference Include="MongoDB.Driver" Version="3.2.1"/>
         <PackageReference Include="MongoDB.Driver.Core" Version="2.30.0"/>
         <PackageReference Include="AspNetCore.HealthChecks.MongoDb" Version="9.0.0"/>
     </ItemGroup>

src/client/package.json

@@ -12,7 +12,7 @@
     "@reduxjs/toolkit": "2.6.0",
     "@tippyjs/react": "4.2.6",
     "axios": "1.8.1",
-    "next": "15.2.1",
+    "next": "16.0.8",
     "next-pwa": "5.6.0",
     "react": "19.0.0",
     "react-dom": "19.0.0",
@@ -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": "16.0.8",
     "postcss": "8.5.3",
     "postcss-import": "16.1.0",
     "prettier": "3.5.3",