More os modes

keymaps/custom/os_mode.h

@@ -0,0 +1,18 @@
+#pragma once
+
+#include <stdbool.h>
+
+// Active OS mode, determines which shortcut rewrites are applied.
+// Set automatically by OS detection or manually via FN+Del cycle.
+typedef enum {
+    OS_MODE_NONE,    // no shortcut rewrites
+    OS_MODE_LINUX,   // linux-specific rewrites (e.g. Super+Up -> Super+W)
+    OS_MODE_MAC,     // Ctrl->Super rewrites, Spotlight tap, etc.
+    OS_MODE_WINDOWS, // reserved, currently same as none
+} os_mode_t;
+
+// Current mode, defined in os_detect.c
+extern os_mode_t os_mode;
+
+// True once user manually cycles mode via FN+Del, prevents OS detection override
+extern bool os_mode_manual;