LibGUI: Use new layout system for basic widgets

Author: https://github.com/frhun
Commit: 19fac58e49
Pull-request: https://github.com/SerenityOS/serenity/pull/14261
Reviewed-by: https://github.com/AtkinsSJ ✅
Reviewed-by: https://github.com/MacDue
Reviewed-by: https://github.com/mjz19910

Userland/Libraries/LibGUI/Button.h

@@ -57,6 +57,8 @@ public:
     void set_mimic_pressed(bool mimic_pressed);
     bool is_mimic_pressed() const { return m_mimic_pressed; };
 
+    virtual Optional<UISize> calculated_min_size() const override;
+
 protected:
     explicit Button(String text = {});
     virtual void mousedown_event(MouseEvent&) override;