[refactor] reorganize platform and wire sources

apps/desktop/src/gui/runtime/gui_state.h

@@ -0,0 +1,21 @@
+/*
+ * Aggregate state visible to GuiRuntime and GuiApplication.
+ *
+ * Definitions live beside their owners: SDL/window state in application and
+ * connection/session state in runtime. This header is intentionally only the
+ * composition point.
+ */
+
+#ifndef CROSSDESK_GUI_STATE_H_
+#define CROSSDESK_GUI_STATE_H_
+
+#include "application/application_state.h"
+#include "runtime/runtime_state.h"
+
+namespace crossdesk::gui_detail {
+
+struct GuiState : ApplicationState, RuntimeState {};
+
+} // namespace crossdesk::gui_detail
+
+#endif // CROSSDESK_GUI_STATE_H_