refactor: remove double logic, change names

web/src/lib/components/ui/dismiss.ts

@@ -0,0 +1,19 @@
+// Popover dismiss: close on pointerdown outside the root and on Escape.
+// Subscribe inside `$effect` while the popover is open; returns unsubscribe.
+export function onDismiss(
+	root: () => HTMLElement | null,
+	close: () => void,
+): () => void {
+	function onPointerDown(e: PointerEvent) {
+		if (!root()?.contains(e.target as Node)) close();
+	}
+	function onKey(e: KeyboardEvent) {
+		if (e.key === "Escape") close();
+	}
+	window.addEventListener("pointerdown", onPointerDown);
+	window.addEventListener("keydown", onKey);
+	return () => {
+		window.removeEventListener("pointerdown", onPointerDown);
+		window.removeEventListener("keydown", onKey);
+	};
+}