[refactor] reorganize platform and wire sources

apps/desktop/src/gui/render.h

@@ -0,0 +1,28 @@
+#ifndef CROSSDESK_GUI_RENDER_H_
+#define CROSSDESK_GUI_RENDER_H_
+
+#include <memory>
+
+namespace crossdesk {
+
+class GuiApplication;
+
+// Stable application-facing facade. The SDL application and feature
+// controllers remain private implementation details.
+class Render {
+public:
+  Render();
+  ~Render();
+
+  Render(const Render &) = delete;
+  Render &operator=(const Render &) = delete;
+
+  int Run();
+
+private:
+  std::unique_ptr<GuiApplication> application_;
+};
+
+} // namespace crossdesk
+
+#endif // CROSSDESK_GUI_RENDER_H_