feat(aci): Add issue preview to cron monitor form

static/app/views/detectors/components/forms/cron/cronIssuePreview.tsx

@@ -0,0 +1,37 @@
+import {t} from 'sentry/locale';
+import {DetectorIssuePreview} from 'sentry/views/detectors/components/forms/common/detectorIssuePreview';
+import {IssuePreviewSection} from 'sentry/views/detectors/components/forms/common/issuePreviewSection';
+import {ownerToActor} from 'sentry/views/detectors/components/forms/common/ownerToActor';
+import {useDetectorFormContext} from 'sentry/views/detectors/components/forms/context';
+import {useCronDetectorFormField} from 'sentry/views/detectors/components/forms/cron/fields';
+
+const FALLBACK_ISSUE_TITLE = t('Cron failure: …');
+const SUBTITLE = t('Your monitor is failing: A missed check-in was detected');
+
+function useCronIssueTitle() {
+  const name = useCronDetectorFormField('name');
+
+  if (!name) {
+    return FALLBACK_ISSUE_TITLE;
+  }
+
+  return t('Cron failure: %s', name);
+}
+
+export function CronIssuePreview({step}: {step?: number}) {
+  const owner = useCronDetectorFormField('owner');
+  const issueTitle = useCronIssueTitle();
+  const assignee = ownerToActor(owner);
+  const {project} = useDetectorFormContext();
+
+  return (
+    <IssuePreviewSection step={step}>
+      <DetectorIssuePreview
+        issueTitle={issueTitle}
+        subtitle={SUBTITLE}
+        assignee={assignee}
+        project={project}
+      />
+    </IssuePreviewSection>
+  );
+}

static/app/views/detectors/components/forms/cron/index.spec.tsx

@@ -1,7 +1,7 @@
 import {OrganizationFixture} from 'sentry-fixture/organization';
 import {ProjectFixture} from 'sentry-fixture/project';
 
-import {render, screen} from 'sentry-test/reactTestingLibrary';
+import {render, screen, userEvent} from 'sentry-test/reactTestingLibrary';
 
 import {OrganizationStore} from 'sentry/stores/organizationStore';
 import {ProjectsStore} from 'sentry/stores/projectsStore';
@@ -58,7 +58,7 @@ describe('NewCronDetectorForm', () => {
 
     // Form sections should be visible
     expect(await screen.findByText(/Detect/)).toBeInTheDocument();
-    expect(screen.getByText(/Assign/)).toBeInTheDocument();
+    expect(screen.getByText(/\d\. Assign/)).toBeInTheDocument();
     expect(screen.getByText(/Description/)).toBeInTheDocument();
 
     // Create Monitor button should be present and enabled
@@ -80,15 +80,34 @@ describe('NewCronDetectorForm', () => {
 
     // Form sections should be hidden
     expect(screen.queryByText(/Detect/)).not.toBeInTheDocument();
-    expect(screen.queryByText(/Assign/)).not.toBeInTheDocument();
-    expect(screen.queryByText(/Description/)).not.toBeInTheDocument();
 
     // Create Monitor button should be present but disabled
     const createButton = screen.getByRole('button', {name: 'Create Monitor'});
     expect(createButton).toBeInTheDocument();
     expect(createButton).toBeDisabled();
   });
 
+  it('renders issue preview and updates title when name changes', async () => {
+    renderForm();
+
+    // Issue preview section should render with fallback title
+    expect(await screen.findByTestId('issue-preview-section')).toBeInTheDocument();
+    expect(screen.getByText('Cron failure: …')).toBeInTheDocument();
+    expect(
+      screen.getByText('Your monitor is failing: A missed check-in was detected')
+    ).toBeInTheDocument();
+
+    // Edit the monitor name
+    const title = screen.getByText('New Monitor');
+    await userEvent.click(title);
+    const nameInput = screen.getByRole('textbox', {name: 'Monitor Name'});
+    await userEvent.clear(nameInput);
+    await userEvent.type(nameInput, 'My Cron Job{Enter}');
+
+    // Issue preview updates with the new name
+    expect(await screen.findByText('Cron failure: My Cron Job')).toBeInTheDocument();
+  });
+
   it('shows form sections and enabled button when guide is set to "manual"', async () => {
     renderForm({
       location: {
@@ -99,7 +118,7 @@ describe('NewCronDetectorForm', () => {
 
     // Form sections should be visible even with platform set, because guide is "manual"
     expect(await screen.findByText(/Detect/)).toBeInTheDocument();
-    expect(screen.getByText(/Assign/)).toBeInTheDocument();
+    expect(screen.getByText(/\d\. Assign/)).toBeInTheDocument();
     expect(screen.getByText(/Description/)).toBeInTheDocument();
 
     // Create Monitor button should be present and enabled

static/app/views/detectors/components/forms/cron/index.tsx

@@ -22,6 +22,7 @@ import {EditDetectorLayout} from 'sentry/views/detectors/components/forms/editDe
 import {NewDetectorLayout} from 'sentry/views/detectors/components/forms/newDetectorLayout';
 import {useCronsUpsertGuideState} from 'sentry/views/insights/crons/components/useCronsUpsertGuideState';
 
+import {CronIssuePreview} from './cronIssuePreview';
 import {PreviewSection} from './previewSection';
 
 function useIsShowingPlatformGuide() {
@@ -35,6 +36,7 @@ const FORM_SECTIONS = [
   CronDetectorFormResolveSection,
   AssignSection,
   DescribeSection,
+  CronIssuePreview,
   AutomateSection,
 ];