desktop code refactoring

Signed-off-by: Peter Siegmund <developer@mars3142.org>

src/ui/Matrix.h

@@ -0,0 +1,17 @@
+#pragma once
+
+#include "model/Window.h"
+
+class Matrix {
+public:
+    explicit Matrix(Window* window);
+
+    [[nodiscard]] Window* window() const;
+
+    void render() const;
+
+private:
+    void draw_colored_grid(int rows, int cols, float cellSize, float spacing) const;
+
+    Window* m_window;
+};