I think this is the best I can do for a hover vs. click shader effect. Just do it in a shader based on a uniform setting.

status_ui.hpp

@@ -20,7 +20,7 @@ namespace gui {
       void select_slot(DinkyECS::Entity ent, std::any data);
       void select_ritual();
       void update_level(GameLevel &level);
-      bool mouse(float x, float y);
+      bool mouse(float x, float y, bool hover);
       void log(std::wstring msg);
       void init();
       void render(sf::RenderWindow &window);