fix: ensure all Init() calls invoke base class methods for proper init

src/libprojectM/Renderer/Backend/OpenGL/OpenGLCopyTexture.hpp

@@ -22,7 +22,9 @@ public:
     // Mark override for clarity and to avoid hiding warnings
     void Init() override
     {
+        // Call both base class Init() to ensure proper initialization
         OpenGLRenderItem::Init();
+        CopyTexture::Init();
     }
 
     using OpenGLRenderItem::Init; // Unhide base Init() to avoid -Woverloaded-virtual warning

src/libprojectM/Renderer/Backend/OpenGL/OpenGLPresetTransition.hpp

@@ -24,7 +24,9 @@ public:
     // Mark override for clarity and to avoid hiding warnings
     void Init() override
     {
+        // Call both base class Init() to ensure proper initialization
         OpenGLRenderItem::Init();
+        PresetTransition::Init();
     }
 
     using OpenGLRenderItem::Init; // Unhide base Init() to avoid -Woverloaded-virtual warning

src/libprojectM/Renderer/Backend/OpenGL/OpenGLRenderItem.hpp

@@ -25,7 +25,8 @@ public:
     void Init() override;
 
 protected:
-    using ::libprojectM::Renderer::RenderItem::Init; // Unhide base Init() to avoid -Woverloaded-virtual warning
+    // Unhide base Init() to avoid -Woverloaded-virtual warning and allow calling base from derived
+    using ::libprojectM::Renderer::RenderItem::Init;
     GLuint m_vboID{0};
     GLuint m_vaoID{0};
 };