refactor: better shortcut hook

packages/ui/lib/shortcuts/store.ts

@@ -0,0 +1,40 @@
+import { type RefObject } from "react";
+
+// internal map
+const keys = new Map<string, RefObject<() => void>>();
+
+// cached snapshot (stable reference)
+let snapshot: [string, RefObject<() => void>][] = [];
+
+let listeners = new Set<() => void>();
+
+function emit() {
+  // refresh snapshot ONLY when keys actually change
+  snapshot = Array.from(keys.entries());
+  for (const fn of listeners) fn();
+}
+
+export const keysStore = {
+  subscribe(fn: () => void) {
+    listeners.add(fn);
+    return () => listeners.delete(fn);
+  },
+
+  getSnapshot() {
+    return snapshot; // stable unless emit() ran
+  },
+
+  register(key: string, ref: RefObject<() => void>) {
+    keys.set(key, ref);
+    emit();
+  },
+
+  deregister(key: string) {
+    keys.delete(key);
+    emit();
+  },
+
+  getHandler(key: string) {
+    return keys.get(key)?.current;
+  },
+};