Route UI thread lifecycle through platform services

src/platform_windows/windows_platform_services.cpp

@@ -170,6 +170,14 @@ public:
         (void)visible;
     }
 
+    void attach_ui_thread() override
+    {
+    }
+
+    void detach_ui_thread() override
+    {
+    }
+
     void update_platform_frame(float delta_time_seconds) override
     {
         win32_update_stylus(delta_time_seconds);