Fix attachment preview test act helpers

ui/src/components/IssueAttachmentsSection.test.tsx

@@ -2,7 +2,8 @@
 
 import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
 import type { IssueAttachment } from "@paperclipai/shared";
-import { act, type ComponentProps, type ReactNode } from "react";
+import type { ComponentProps, ReactNode } from "react";
+import { flushSync } from "react-dom";
 import { createRoot, type Root } from "react-dom/client";
 import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
 import { IssueAttachmentsSection } from "./IssueAttachmentsSection";
@@ -33,6 +34,14 @@ vi.mock("@/components/ui/button", () => ({
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
 (globalThis as any).IS_REACT_ACT_ENVIRONMENT = true;
 
+async function act(callback: () => void | Promise<void>) {
+  let result: void | Promise<void> = undefined;
+  flushSync(() => {
+    result = callback();
+  });
+  await result;
+}
+
 function makeAttachment(overrides: Partial<IssueAttachment> = {}): IssueAttachment {
   return {
     id: "attachment-1",
@@ -64,6 +73,20 @@ async function flushReact() {
   });
 }
 
+async function waitForAssertion(assertion: () => void, attempts = 20) {
+  let lastError: unknown;
+  for (let index = 0; index < attempts; index += 1) {
+    try {
+      assertion();
+      return;
+    } catch (error) {
+      lastError = error;
+      await flushReact();
+    }
+  }
+  throw lastError;
+}
+
 describe("IssueAttachmentsSection", () => {
   let container: HTMLDivElement;
   let root: Root;
@@ -122,10 +145,12 @@ describe("IssueAttachmentsSection", () => {
         headers: expect.objectContaining({ Accept: expect.stringContaining("text/markdown") }),
       }),
     );
-    expect(container.querySelector('[data-testid="fold-curtain"]')).toBeTruthy();
+    await waitForAssertion(() => {
-    const markdownBody = container.querySelector('[data-testid="markdown-body"]');
+      expect(container.querySelector('[data-testid="fold-curtain"]')).toBeTruthy();
-    expect(markdownBody?.textContent).toContain("Imported plan");
+      const markdownBody = container.querySelector('[data-testid="markdown-body"]');
-    expect(markdownBody?.className).toContain("paperclip-edit-in-place-content");
+      expect(markdownBody?.textContent).toContain("Imported plan");
+      expect(markdownBody?.className).toContain("paperclip-edit-in-place-content");
+    });
   });
 
   it("renders video attachments through the same player used for artifact outputs", async () => {

ui/src/pages/IssueDetail.test.tsx

@@ -2,7 +2,8 @@
 
 import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
 import type { Agent, Issue, IssueTreeControlPreview, IssueTreeHold } from "@paperclipai/shared";
-import { act, type AnchorHTMLAttributes, type ButtonHTMLAttributes, type ReactNode } from "react";
+import type { AnchorHTMLAttributes, ButtonHTMLAttributes, ReactNode } from "react";
+import { flushSync } from "react-dom";
 import { createRoot, type Root } from "react-dom/client";
 import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
 import { canBoardResolveRecoveryAction, IssueDetail } from "./IssueDetail";
@@ -357,6 +358,14 @@ vi.mock("@/components/ui/textarea", () => ({
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
 (globalThis as any).IS_REACT_ACT_ENVIRONMENT = true;
 
+async function act(callback: () => void | Promise<void>) {
+  let result: void | Promise<void> = undefined;
+  flushSync(() => {
+    result = callback();
+  });
+  await result;
+}
+
 function createDeferred<T>() {
   let resolve!: (value: T) => void;
   const promise = new Promise<T>((innerResolve) => {