FN-7377: hide failed banner in expanded planner chat

Hide failed-task alert chrome while the task planner chat is maximized.

- Gate the failed-task banner on Planner Chat expansion state so the expanded conversation gets the full detail surface.\n- Preserve failed-banner visibility for normal detail, collapsed Planner Chat, and expanded Activity views.\n- Add dashboard regression coverage and a patch changeset for the published CLI package.\n\nFiles changed:\n .changeset/fn-7377-planner-chat-failed-banner.md   |   7 ++\n .../dashboard/app/components/TaskDetailModal.tsx   |   7 +-\n .../components/__tests__/TaskDetailModal.test.tsx  | 101 +++++++++++++++++++++\n 3 files changed, 114 insertions(+), 1 deletion(-)

Fusion-Task-Id: FN-7377

Fusion-Task-Lineage: 5cd8c846-a27d-4040-8124-ecf547300c78

Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>

.changeset/fn-7377-planner-chat-failed-banner.md

@@ -0,0 +1,7 @@
+---
+"@runfusion/fusion": patch
+---
+
+summary: Hide failed-task banners while task planner chat is maximized.
+category: fix
+dev: TaskDetailModal no longer mounts failed-banner chrome during expanded planner Chat; Activity and collapsed detail still show failures.

packages/dashboard/app/components/TaskDetailModal.tsx

@@ -2728,6 +2728,11 @@ export function TaskDetailContent({
   Maximized Activity applies to Live, Feed, and Raw Logs, not only the legacy `current` chat segment. Reserve the detail surface for header context and Activity content, and do not mount branch-group chrome in this mode so expand/promote controls are not hidden-but-focusable.
   */
   const shouldShowBranchGroupCard = Boolean(task.branchContext?.groupId && !isActivityExpanded);
+  /*
+  FNXC:TaskDetailPlannerChat 2026-07-01-00:00:
+  Maximized Planner Chat reserves vertical room for task identity and the planner conversation, so failed-task chrome is not mounted in that state. Normal detail, Activity expansion, and collapsed Planner Chat still surface task failures immediately.
+  */
+  const shouldShowTaskFailureAlert = Boolean(task.status === "failed" && task.error && !isPlannerChatExpanded);
 
   const taskActionMenuModel = useMemo(() => buildTaskActionMenuModel({
     task,
@@ -3463,7 +3468,7 @@ export function TaskDetailContent({
               {isWorkspaceTask(workingTask) && <WorkspaceWorktreesSummary task={workingTask} />}
             </>
           )}
-          {task.status === "failed" && task.error && (
+          {shouldShowTaskFailureAlert && (
             <div className="detail-error-alert">
               <span className="detail-error-icon">⚠</span>
               <div className="detail-error-content">

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

@@ -228,6 +228,107 @@ describe("TaskDetailModal planner Chat tab", () => {
     expect(detail).toHaveClass("task-detail-content--planner-chat-expanded");
     expect(detail).not.toHaveClass("task-detail-content--chat-expanded");
   });
+
+  it("hides failed-task banner only while planner Chat is expanded and restores it on collapse", async () => {
+    const user = userEvent.setup();
+    const { container } = render(
+      <TaskDetailModal
+        initialTab="planner-chat"
+        taskDetailChatFirst
+        task={makeTask({ column: "todo" as any, status: "failed", error: "Planner failed hard" })}
+        onClose={noop}
+        onMoveTask={noopMove}
+        onDeleteTask={noopDelete}
+        onMergeTask={noopMerge}
+        onOpenDetail={noopOpenDetail}
+        addToast={noop}
+      />,
+    );
+    const detail = container.querySelector(".task-detail-content");
+
+    expect(screen.getByText("Task Failed")).toBeInTheDocument();
+    expect(screen.getByText("Planner failed hard")).toBeInTheDocument();
+    expect(container.querySelector(".detail-error-alert")).toBeInTheDocument();
+
+    await user.click(screen.getByTestId("task-planner-chat-expand-toggle"));
+
+    expect(detail).toHaveClass("task-detail-content--planner-chat-expanded");
+    expect(screen.queryByText("Task Failed")).not.toBeInTheDocument();
+    expect(screen.queryByText("Planner failed hard")).not.toBeInTheDocument();
+    expect(container.querySelector(".detail-error-alert")).toBeNull();
+
+    await user.click(screen.getByTestId("task-planner-chat-expand-toggle"));
+
+    expect(detail).not.toHaveClass("task-detail-content--planner-chat-expanded");
+    expect(screen.getByText("Task Failed")).toBeInTheDocument();
+    expect(screen.getByText("Planner failed hard")).toBeInTheDocument();
+    expect(container.querySelector(".detail-error-alert")).toBeInTheDocument();
+  });
+
+  it("keeps failed-task banner visible while Activity is expanded", async () => {
+    const user = userEvent.setup();
+    const { container } = render(
+      <TaskDetailModal
+        initialTab="chat"
+        taskDetailChatFirst
+        task={makeTask({ column: "todo" as any, status: "failed", error: "Activity failure stays visible" })}
+        onClose={noop}
+        onMoveTask={noopMove}
+        onDeleteTask={noopDelete}
+        onMergeTask={noopMerge}
+        onOpenDetail={noopOpenDetail}
+        addToast={noop}
+      />,
+    );
+    const detail = container.querySelector(".task-detail-content");
+
+    expect(screen.getByText("Task Failed")).toBeInTheDocument();
+    expect(screen.getByText("Activity failure stays visible")).toBeInTheDocument();
+
+    await user.click(screen.getByTestId("task-chat-expand-toggle"));
+
+    expect(detail).toHaveClass("task-detail-content--chat-expanded");
+    expect(detail).not.toHaveClass("task-detail-content--planner-chat-expanded");
+    expect(screen.getByText("Task Failed")).toBeInTheDocument();
+    expect(screen.getByText("Activity failure stays visible")).toBeInTheDocument();
+    expect(container.querySelector(".detail-error-alert")).toBeInTheDocument();
+  });
+
+  it("does not render empty failed-task alert shells for non-failed or errorless failed tasks", () => {
+    const { container, rerender } = render(
+      <TaskDetailModal
+        initialTab="planner-chat"
+        taskDetailChatFirst
+        task={makeTask({ column: "todo" as any, status: "failed" })}
+        onClose={noop}
+        onMoveTask={noopMove}
+        onDeleteTask={noopDelete}
+        onMergeTask={noopMerge}
+        onOpenDetail={noopOpenDetail}
+        addToast={noop}
+      />,
+    );
+
+    expect(screen.queryByText("Task Failed")).not.toBeInTheDocument();
+    expect(container.querySelector(".detail-error-alert")).toBeNull();
+
+    rerender(
+      <TaskDetailModal
+        initialTab="planner-chat"
+        taskDetailChatFirst
+        task={makeTask({ column: "todo" as any, status: "in-progress", error: "Ignored because task is not failed" })}
+        onClose={noop}
+        onMoveTask={noopMove}
+        onDeleteTask={noopDelete}
+        onMergeTask={noopMerge}
+        onOpenDetail={noopOpenDetail}
+        addToast={noop}
+      />,
+    );
+
+    expect(screen.queryByText("Task Failed")).not.toBeInTheDocument();
+    expect(container.querySelector(".detail-error-alert")).toBeNull();
+  });
 });
 
 describe("TaskDetailModal summarize title action", () => {