feat(email): confirm hub thread unlink

JobTrackerApi.Tests/GmailControllerTests.cs

@@ -853,6 +853,35 @@ public sealed class GmailControllerTests
         Assert.Equal("Need manual review", decision.Note);
     }
 
+    [Fact]
+    public async Task Unlink_thread_cannot_remove_another_users_messages()
+    {
+        await using var db = CreateDb();
+        var company = new Company { Name = "Other company", OwnerUserId = "user-2" };
+        db.Companies.Add(company);
+        await db.SaveChangesAsync();
+
+        var job = new JobApplication { JobTitle = "Private role", CompanyId = company.Id, OwnerUserId = "user-2" };
+        db.JobApplications.Add(job);
+        await db.SaveChangesAsync();
+        db.Correspondences.Add(new Correspondence
+        {
+            JobApplicationId = job.Id,
+            From = "Company",
+            Content = "Private message",
+            ExternalMessageId = "other-message",
+            ExternalThreadId = "other-thread"
+        });
+        await db.SaveChangesAsync();
+
+        var controller = CreateController(db, Mock.Of<IGmailOAuthService>(), "user-1");
+        var result = await controller.UnlinkThread(new UnlinkGmailThreadRequest(job.Id, "other-thread", null, "review"), CancellationToken.None);
+
+        Assert.IsType<NotFoundObjectResult>(result.Result);
+        Assert.Single(await db.Correspondences.IgnoreQueryFilters().ToListAsync());
+        Assert.Empty(await db.GmailReviewDecisions.IgnoreQueryFilters().ToListAsync());
+    }
+
     [Fact]
     public async Task Relink_thread_can_move_messages_from_other_jobs()
     {

job-tracker-ui/src/correspondence-inbox-page.test.tsx

@@ -1,6 +1,6 @@
 import React from 'react';
 import '@testing-library/jest-dom';
-import { fireEvent, render, screen, waitFor } from '@testing-library/react';
+import { fireEvent, render, screen, waitFor, within } from '@testing-library/react';
 import { MemoryRouter, Navigate, Route, Routes } from 'react-router-dom';
 import { ToastProvider } from './toast';
 import { ConfirmProvider } from './confirm';
@@ -120,6 +120,27 @@ describe('CorrespondenceInboxPage', () => {
     });
   });
 
+  test('unlinks a Gmail thread only after confirmation and returns it to review', async () => {
+    mockedApi.post.mockResolvedValue({ data: { threadId: 'thread-1', jobApplicationId: 42, removedMessages: 1, decision: 'review' } } as any);
+    renderPage();
+
+    fireEvent.click(await screen.findByRole('button', { name: /^unlink thread$/i }));
+    expect(mockedApi.post).not.toHaveBeenCalled();
+
+    const dialog = await screen.findByRole('dialog');
+    expect(within(dialog).getByText(/provider copy is not deleted/i)).toBeInTheDocument();
+    fireEvent.click(within(dialog).getByRole('button', { name: /^unlink thread$/i }));
+
+    await waitFor(() => expect(mockedApi.post).toHaveBeenCalledWith('/gmail/unlink-thread', {
+      jobApplicationId: 42,
+      threadId: 'thread-1',
+      note: 'Unlinked from Job email hub',
+      nextDecision: 'review',
+    }));
+    await waitFor(() => expect(mockedApi.get).toHaveBeenCalledWith('/correspondence', expect.anything()));
+    expect(await screen.findByText(/returned to recruitment review/i)).toBeInTheDocument();
+  });
+
   test('falls back to the saved copy when provider detail is unavailable', async () => {
     const original = mockedApi.get.getMockImplementation();
     mockedApi.get.mockImplementation((url: string, config?: any) => {

job-tracker-ui/src/views/CorrespondenceInboxPage.tsx

@@ -108,6 +108,7 @@ export default function CorrespondenceInboxPage() {
   const [sendResult, setSendResult] = useState<EmailSendResult | null>(null);
   const [sendError, setSendError] = useState<string | null>(null);
   const [sending, setSending] = useState(false);
+  const [unlinkingThreadId, setUnlinkingThreadId] = useState<string | null>(null);
 
   const load = useCallback(async () => {
     setLoading(true);
@@ -281,6 +282,37 @@ export default function CorrespondenceInboxPage() {
     setSendError(null);
   };
 
+  const unlinkGmailThread = async (item: CorrespondenceInboxItem) => {
+    if (item.provider !== "gmail" || !item.externalThreadId || unlinkingThreadId) return;
+    if (!(await confirm({
+      title: "Unlink Gmail thread?",
+      message: `Remove this Gmail thread from ${item.companyName || "this job"} and return it to recruitment review? The provider copy is not deleted.`,
+      confirmLabel: "Unlink thread",
+      destructive: true,
+    }))) return;
+
+    setUnlinkingThreadId(item.externalThreadId);
+    try {
+      await api.post("/gmail/unlink-thread", {
+        jobApplicationId: item.jobApplicationId,
+        threadId: item.externalThreadId,
+        note: "Unlinked from Job email hub",
+        nextDecision: "review",
+      });
+      if (selectedMessageId === item.id) {
+        detailRequest.current += 1;
+        setSelectedMessageId(null);
+        setMessageDetail(null);
+      }
+      await load();
+      toast("Gmail thread returned to recruitment review.", "success");
+    } catch (error) {
+      toast(getApiErrorMessage(error, "Failed to unlink the Gmail thread."), "error");
+    } finally {
+      setUnlinkingThreadId(null);
+    }
+  };
+
   return (
     <Paper
       sx={{
@@ -401,6 +433,11 @@ export default function CorrespondenceInboxPage() {
                 {item.attachmentCount > 0 ? <Chip size="small" label={`${item.attachmentCount} attachments`} variant="outlined" /> : null}
                 <Button size="small" variant="text" onClick={() => void showMessage(item)}>{selectedMessageId === item.id ? "Hide message" : "View message"}</Button>
                 <Button size="small" variant="text" onClick={() => navigate(`/jobs?open=${item.jobApplicationId}`)}>Open job</Button>
+                {item.provider === "gmail" && item.externalThreadId ? (
+                  <Button size="small" color="warning" variant="text" disabled={unlinkingThreadId === item.externalThreadId} onClick={() => void unlinkGmailThread(item)}>
+                    {unlinkingThreadId === item.externalThreadId ? "Unlinking…" : "Unlink thread"}
+                  </Button>
+                ) : null}
               </Box>
             </Box>
             {selectedMessageId === item.id ? (