feat(FN-4144): add GitHub tracking indicator to task cards

Adds a GitHub link indicator to task cards with styling and hover behavior, accompanied by tests to cover the new icon display logic.

Fusion-Task-Id: FN-4144

packages/dashboard/app/components/TaskCard.css

@@ -615,6 +615,30 @@
   align-items: center;
 }
 
+.card-github-tracking-link {
+  min-width: calc(var(--space-xl) + var(--space-md));
+  min-height: calc(var(--space-xl) + var(--space-md));
+  padding: var(--space-xs);
+  border-radius: var(--radius-md);
+  text-decoration: none;
+  transition:
+    background-color var(--transition-fast),
+    color var(--transition-fast),
+    box-shadow var(--transition-fast);
+}
+
+.card-github-tracking-link:hover {
+  background: var(--card-hover);
+  color: var(--text);
+}
+
+.card-github-tracking-link:focus-visible {
+  background: var(--card-hover);
+  color: var(--text);
+  box-shadow: var(--focus-ring-strong);
+  outline: none;
+}
+
 .card-time-indicator {
   display: inline-flex;
   align-items: center;
@@ -1139,6 +1163,11 @@
     font-size: 0.625rem;
   }
 
+  .card-github-tracking-link {
+    min-width: calc(var(--space-xl) + var(--space-xl));
+    min-height: calc(var(--space-xl) + var(--space-xl));
+  }
+
   /* Card: smaller status badges for 280px width */
   .card-status-badge {
     font-size: 0.5625rem;

packages/dashboard/app/components/TaskCard.tsx

@@ -736,8 +736,13 @@ function TaskCardComponent({
 
   // Check if this card can be edited inline
   const canEdit = EDITABLE_COLUMNS.has(task.column) && !isAgentActive && !isPaused && !queued && onUpdateTask;
+  const githubTrackedIssue = task.githubTracking?.issue;
+  const hasGithubTrackingLink = Boolean(githubTrackedIssue);
   const hasGitHubBadge = Boolean(task.prInfo || task.issueInfo);
   const isGitHubImportedTask = task.sourceType === "github_import";
+  const showTrackingIndicator = hasGithubTrackingLink
+    && !isGitHubImportedTask
+    && !(task.issueInfo && task.issueInfo.number === githubTrackedIssue?.number);
   const branchMetadata = useMemo(() => getVisibleTaskCardBranches(task), [task.id, task.branch, task.baseBranch]);
   const hasBranchMetadata = Boolean(branchMetadata.branch || branchMetadata.baseBranch);
   const sourceIssueUrl = getIssueUrlFromMetadata(task.sourceMetadata);
@@ -1602,7 +1607,7 @@ function TaskCardComponent({
           </>
         );
       })()}
-      {(filesChangedButton || timeIndicator || isGitHubImportedTask) && (
+      {(filesChangedButton || timeIndicator || isGitHubImportedTask || showTrackingIndicator) && (
         <div className="card-footer-row">
           {filesChangedButton}
           {isGitHubImportedTask && (
@@ -1614,6 +1619,19 @@ function TaskCardComponent({
               <ProviderIcon provider="github" size="sm" />
             </span>
           )}
+          {showTrackingIndicator && githubTrackedIssue && (
+            <a
+              className="card-source-provenance card-github-tracking-link"
+              href={githubTrackedIssue.url}
+              target="_blank"
+              rel="noopener noreferrer"
+              title={`Linked GitHub issue: ${githubTrackedIssue.owner}/${githubTrackedIssue.repo}#${githubTrackedIssue.number}`}
+              aria-label={`Linked GitHub issue #${githubTrackedIssue.number}`}
+              onClick={(e) => e.stopPropagation()}
+            >
+              <ProviderIcon provider="github" size="sm" />
+            </a>
+          )}
           {timeIndicator && (
             <span
               className="card-time-indicator"

packages/dashboard/app/components/__tests__/TaskCard.test.tsx

@@ -1019,6 +1019,131 @@ describe("TaskCard", () => {
     expect(screen.queryByTestId("provider-icon-github")).toBeNull();
   });
 
+  it("renders a GitHub tracking link for tracked issues on non-imported tasks", () => {
+    render(
+      <TaskCard
+        task={makeTask({
+          column: "todo",
+          sourceType: "dashboard_ui",
+          githubTracking: {
+            issue: {
+              owner: "owner",
+              repo: "repo",
+              number: 42,
+              url: "https://github.com/owner/repo/issues/42",
+              createdAt: "2026-05-12T00:00:00.000Z",
+            },
+          },
+        })}
+        onOpenDetail={noop}
+        addToast={noop}
+      />,
+    );
+
+    const link = screen.getByRole("link", { name: "Linked GitHub issue #42" });
+    expect(link.getAttribute("href")).toBe("https://github.com/owner/repo/issues/42");
+    expect(link.getAttribute("title")).toBe("Linked GitHub issue: owner/repo#42");
+    expect(link).toHaveClass("card-github-tracking-link");
+    expect(screen.getByTestId("provider-icon-github")).toBeDefined();
+  });
+
+  it("does not render a GitHub tracking link when githubTracking is absent", () => {
+    render(
+      <TaskCard
+        task={makeTask({
+          column: "todo",
+          sourceType: "dashboard_ui",
+        })}
+        onOpenDetail={noop}
+        addToast={noop}
+      />,
+    );
+
+    expect(screen.queryByRole("link", { name: /Linked GitHub issue/i })).toBeNull();
+  });
+
+  it("does not render a GitHub tracking link for github_import tasks", () => {
+    render(
+      <TaskCard
+        task={makeTask({
+          column: "todo",
+          sourceType: "github_import",
+          sourceMetadata: { issueUrl: "https://github.com/owner/repo/issues/42" },
+          githubTracking: {
+            issue: {
+              owner: "owner",
+              repo: "repo",
+              number: 42,
+              url: "https://github.com/owner/repo/issues/42",
+              createdAt: "2026-05-12T00:00:00.000Z",
+            },
+          },
+        })}
+        onOpenDetail={noop}
+        addToast={noop}
+      />,
+    );
+
+    expect(screen.queryByRole("link", { name: /Linked GitHub issue/i })).toBeNull();
+    expect(screen.getByLabelText("Imported from GitHub")).toBeDefined();
+  });
+
+  it("does not render a GitHub tracking link when a matching issue badge is already shown", () => {
+    render(
+      <TaskCard
+        task={makeTask({
+          column: "todo",
+          sourceType: "dashboard_ui",
+          githubTracking: {
+            issue: {
+              owner: "owner",
+              repo: "repo",
+              number: 42,
+              url: "https://github.com/owner/repo/issues/42",
+              createdAt: "2026-05-12T00:00:00.000Z",
+            },
+          },
+          issueInfo: {
+            url: "https://github.com/owner/repo/issues/42",
+            number: 42,
+            state: "open",
+            title: "Issue",
+          },
+        })}
+        onOpenDetail={noop}
+        addToast={noop}
+      />,
+    );
+
+    expect(screen.queryByRole("link", { name: /Linked GitHub issue/i })).toBeNull();
+  });
+
+  it("clicking the GitHub tracking link does not open the task detail modal", () => {
+    const onOpenDetail = vi.fn();
+    render(
+      <TaskCard
+        task={makeTask({
+          column: "todo",
+          sourceType: "dashboard_ui",
+          githubTracking: {
+            issue: {
+              owner: "owner",
+              repo: "repo",
+              number: 42,
+              url: "https://github.com/owner/repo/issues/42",
+              createdAt: "2026-05-12T00:00:00.000Z",
+            },
+          },
+        })}
+        onOpenDetail={onOpenDetail}
+        addToast={noop}
+      />,
+    );
+
+    fireEvent.click(screen.getByRole("link", { name: "Linked GitHub issue #42" }));
+    expect(onOpenDetail).not.toHaveBeenCalled();
+  });
+
   it("renders agent-created provenance badge for automation tasks and prefers sourceMetadata.agentName", () => {
     const { container } = render(
       <TaskCard