fix(hk): protect unsaved editors and await prefix save results

src/hooks/use-unsaved-changes.test.ts

@@ -0,0 +1,57 @@
+import { afterEach, beforeEach, expect, it, vi } from "vitest";
+
+const cleanup = vi.hoisted(() => [] as Array<() => void>);
+vi.mock("react", () => ({
+	useRef: (value: unknown) => ({ current: value }),
+	useCallback: (callback: unknown) => callback,
+	useEffect: (effect: () => (() => void) | undefined) => {
+		const dispose = effect();
+		if (dispose) cleanup.push(dispose);
+	},
+}));
+
+import {
+	confirmUnsavedNavigation,
+	useUnsavedChanges,
+} from "./use-unsaved-changes";
+
+let confirm: ReturnType<typeof vi.fn>;
+beforeEach(() => {
+	confirm = vi.fn().mockReturnValue(false);
+	vi.stubGlobal("window", Object.assign(new EventTarget(), { confirm }));
+	vi.stubGlobal("document", new EventTarget());
+	vi.stubGlobal("location", new URL("https://hotel.test/admin/editor"));
+});
+afterEach(() => {
+	for (const dispose of cleanup.splice(0)) dispose();
+	vi.unstubAllGlobals();
+});
+it("asks once for several dirty forms and allows clean navigation", () => {
+	useUnsavedChanges(true, "Discard changes?");
+	useUnsavedChanges(true, "Other changes?");
+	expect(confirmUnsavedNavigation()).toBe(false);
+	expect(confirm).toHaveBeenCalledTimes(1);
+	confirm.mockReturnValue(true);
+	expect(confirmUnsavedNavigation()).toBe(true);
+});
+it("removes unmounted forms from navigation protection", () => {
+	useUnsavedChanges(true, "Discard changes?");
+	for (const dispose of cleanup.splice(0)) dispose();
+	expect(confirmUnsavedNavigation()).toBe(true);
+	expect(confirm).not.toHaveBeenCalled();
+});
+it("protects explicit close but clears synchronously after successful save", () => {
+	const guard = useUnsavedChanges(true, "Discard changes?");
+	expect(guard.confirmLeave()).toBe(false);
+	guard.markSaved();
+	expect(guard.confirmLeave()).toBe(true);
+	expect(confirmUnsavedNavigation()).toBe(true);
+	expect(confirm).toHaveBeenCalledTimes(1);
+});
+it("keeps reload protected after cancelled navigation", () => {
+	useUnsavedChanges(true, "Discard changes?");
+	confirmUnsavedNavigation();
+	const event = new Event("beforeunload", { cancelable: true });
+	window.dispatchEvent(event);
+	expect(event.defaultPrevented).toBe(true);
+});