Add WPF patterns/WinUI 3 equivalents to TOC

Co-authored-by: Copilot <[email protected]>

Author: GrantMeStrength

hub/apps/develop/toc.yml

@@ -1035,6 +1035,8 @@ items:
         items:
           - name: Integrate Windows App SDK
             href: ../windows-app-sdk/migrate-to-windows-app-sdk/wpf-plus-winappsdk.md
+          - name: WPF patterns and WinUI 3 equivalents
+            href: ../windows-app-sdk/migrate-to-windows-app-sdk/wpf-patterns-winui3.md
           - name: Visual layer
             items:
               - name: Overview