[fix] capture Windows keyboard input with Raw Input, refs #94

src/common/windows_input_marker.h

@@ -0,0 +1,15 @@
+#ifndef CROSSDESK_COMMON_WINDOWS_INPUT_MARKER_H_
+#define CROSSDESK_COMMON_WINDOWS_INPUT_MARKER_H_
+
+#include <cstdint>
+
+namespace crossdesk {
+
+// SendInput copies dwExtraInfo into KBDLLHOOKSTRUCT. Tag CrossDesk-generated
+// keyboard input so the controller hook can ignore only its own injections
+// while still accepting input from accessibility tools or remote sessions.
+inline constexpr std::uintptr_t kInjectedKeyboardInputMarker = 0x4353444B;
+
+}  // namespace crossdesk
+
+#endif  // CROSSDESK_COMMON_WINDOWS_INPUT_MARKER_H_