finish the testing framework

designer/CMakeLists.txt

@@ -66,11 +66,15 @@ add_executable(mosis-designer
     src/testing/action_player.cpp
     src/testing/ui_inspector.cpp
     src/testing/visual_capture.cpp
+    # Local backend with input recording hooks
+    src/backend/RmlUi_Backend_GLFW_GL3.cpp
+    src/backend/RmlUi_Platform_GLFW.cpp
 )
 
 target_include_directories(mosis-designer PRIVATE
     src
     src/testing
+    src/backend
     ../src/main/kernel/include
     ../src/main/cpp
 )