feat(FN-1228): complete Step 1 — Backend API Routes modifications

- Modified POST /api/nodes to make type optional (defaults to 'remote')
- Changed DELETE /api/nodes/:id to return 204 No Content
- Updated GET /api/nodes/:id/metrics to return SystemMetrics from node.systemMetrics
- Added GET /api/mesh/state route for full mesh topology state

packages/dashboard/app/components/MissionManager.tsx

@@ -588,6 +588,14 @@ export function MissionManager({ isOpen, isInline = false, onClose, addToast, pr
       void loadMissionHealth(missions);
     };
 
+    const handleFeatureUpdated = () => {
+      refreshHealth();
+      // Reload the selected mission detail to reflect updated feature status
+      if (selectedMission) {
+        void loadMissionDetail(selectedMission.id);
+      }
+    };
+
     const handleMissionEvent = (rawEvent: Event) => {
       refreshHealth();
 
@@ -634,13 +642,13 @@ export function MissionManager({ isOpen, isInline = false, onClose, addToast, pr
 
     eventSource.addEventListener("mission:updated", refreshHealth);
     eventSource.addEventListener("slice:updated", refreshHealth);
-    eventSource.addEventListener("feature:updated", refreshHealth);
+    eventSource.addEventListener("feature:updated", handleFeatureUpdated);
     eventSource.addEventListener("mission:event", handleMissionEvent);
 
     return () => {
       eventSource.removeEventListener("mission:updated", refreshHealth);
       eventSource.removeEventListener("slice:updated", refreshHealth);
-      eventSource.removeEventListener("feature:updated", refreshHealth);
+      eventSource.removeEventListener("feature:updated", handleFeatureUpdated);
       eventSource.removeEventListener("mission:event", handleMissionEvent);
       eventSource.close();
     };
@@ -649,6 +657,7 @@ export function MissionManager({ isOpen, isInline = false, onClose, addToast, pr
     eventsFilter,
     isActive,
     isActivityScrolledNearBottom,
+    loadMissionDetail,
     loadMissionHealth,
     missions,
     projectId,

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

@@ -762,6 +762,53 @@ describe("MissionManager", () => {
     });
   });
 
+  it("reloads selected mission detail when feature:updated SSE event arrives", async () => {
+    const fetchMock = createDetailFetchMock(mockMissionEvents);
+    globalThis.fetch = fetchMock;
+    globalThis.EventSource = MockEventSource as unknown as typeof globalThis.EventSource;
+
+    render(<MissionManager isOpen={true} onClose={vi.fn()} addToast={vi.fn()} />);
+
+    await waitFor(() => {
+      expect(screen.getByText("Build Auth System")).toBeDefined();
+    });
+
+    // Click on the mission to open detail view
+    fireEvent.click(screen.getByText("Build Auth System"));
+
+    await waitFor(() => {
+      // Back button should appear in detail view
+      expect(screen.getByTestId("mission-back-btn")).toBeDefined();
+    });
+
+    // Record initial fetch calls for mission detail
+    const initialFetchCount = fetchMock.mock.calls.filter(
+      (call) => typeof call[0] === "string" && call[0].includes("/api/missions/M-001")
+    ).length;
+    expect(initialFetchCount).toBeGreaterThan(0);
+
+    // Emit a feature:updated SSE event
+    await act(async () => {
+      for (const source of MockEventSource.instances) {
+        source.emit("feature:updated", {
+          featureId: "F-001",
+          missionId: "M-001",
+          sliceId: "SL-001",
+          previousStatus: "triaged",
+          newStatus: "in-progress",
+        });
+      }
+    });
+
+    // Verify mission detail was reloaded (fetch was called again for the mission)
+    await waitFor(() => {
+      const updatedFetchCount = fetchMock.mock.calls.filter(
+        (call) => typeof call[0] === "string" && call[0].includes("/api/missions/M-001")
+      ).length;
+      expect(updatedFetchCount).toBeGreaterThan(initialFetchCount);
+    });
+  });
+
   it("shows empty state when no missions exist", async () => {
     globalThis.fetch = vi.fn().mockResolvedValue(mockApiResponse([]));
     render(<MissionManager isOpen={true} onClose={vi.fn()} addToast={vi.fn()} />);