test(ui): repair routine tests for React 19 act

ui/src/components/RoutineSaveBar.test.tsx

@@ -1,11 +1,16 @@
 // @vitest-environment jsdom
 
-import { act } from "react";
+import type React from "react";
+import { flushSync } from "react-dom";
 import { createRoot } from "react-dom/client";
 import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
 import { RoutineSaveBar } from "./RoutineSaveBar";
 import type { RoutineHistoryDirtyFieldDescriptor } from "./RoutineHistoryTab";
 
+function act(callback: () => void) {
+  flushSync(callback);
+}
+
 let container: HTMLDivElement;
 let root: ReturnType<typeof createRoot>;
 

ui/src/components/RoutineSubSidebar.test.tsx

@@ -1,6 +1,7 @@
 // @vitest-environment jsdom
 
-import { act, type AnchorHTMLAttributes, type ReactNode } from "react";
+import type { AnchorHTMLAttributes, ReactNode } from "react";
+import { flushSync } from "react-dom";
 import { createRoot } from "react-dom/client";
 import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
 
@@ -22,6 +23,10 @@ vi.mock("@/lib/router", () => ({
 import { RoutineSubSidebar } from "./RoutineSubSidebar";
 import type { RoutineSectionKey } from "./routine-sections/context";
 
+function act(callback: () => void) {
+  flushSync(callback);
+}
+
 let container: HTMLDivElement;
 let root: ReturnType<typeof createRoot>;
 

ui/src/pages/Routines.test.tsx

@@ -1,6 +1,7 @@
 // @vitest-environment jsdom
 
-import { act, type AnchorHTMLAttributes, type ReactNode } from "react";
+import type { AnchorHTMLAttributes, ReactNode } from "react";
+import { flushSync } from "react-dom";
 import { createRoot } from "react-dom/client";
 import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
 import type { Issue, RoutineListItem } from "@paperclipai/shared";
@@ -9,6 +10,14 @@ import { Routines, buildRoutineGroups, sortRoutines } from "./Routines";
 
 let currentSearch = "";
 
+async function act(callback: () => void | Promise<void>) {
+  let result: void | Promise<void> = undefined;
+  flushSync(() => {
+    result = callback();
+  });
+  await result;
+}
+
 const navigateMock = vi.fn();
 const routinesListMock = vi.fn<(companyId: string) => Promise<RoutineListItem[]>>();
 const issuesListMock = vi.fn<(companyId: string, filters?: Record<string, unknown>) => Promise<Issue[]>>();