FN-6707: move throughput card atop overview

Place the Command Center throughput section first across overview states.

- Render the throughput funnel before loading, error, empty, and populated overview content.
- Preserve throughput test anchors while documenting the top-of-page ordering requirement.
- Add regression coverage for throughput ordering in loading, empty, populated, and error overview branches.

Files changed:
 .../app/components/command-center/CommandCenter.tsx | 11 +++++++----
 .../command-center/__tests__/CommandCenter.test.tsx | 21 +++++++++++++++++++++
 2 files changed, 28 insertions(+), 4 deletions(-)

Fusion-Task-Id: FN-6707

Fusion-Task-Lineage: 9b004ab4-e36b-4d83-804a-32503a7d8d72

packages/dashboard/app/components/command-center/CommandCenter.tsx

@@ -217,6 +217,9 @@ function OverviewTab({ range }: { range: DateRange }) {
     },
   ];
 
+  // FNXC:CommandCenter 2026-06-19-00:00:
+  // Throughput funnel now renders first in every overview branch (loading/error/empty/populated)
+  // so the SDLC throughput card is top-of-page; mobile scroll owner and data-testid anchors unchanged.
   // The throughput funnel reads its own data (activityLog transitions) and shows
   // its own empty state, so it renders even when the stat-card aggregates have no
   // data yet.
@@ -229,11 +232,11 @@ function OverviewTab({ range }: { range: DateRange }) {
   if (isInitialLoading) {
     return (
       <div className="cc-overview">
+        {throughputSection}
         <div className="cc-loading" data-testid="command-center-overview-loading">
           <div className="cc-chart-skeleton" />
           <p>{t("commandCenter.loading", "Loading command center...")}</p>
         </div>
-        {throughputSection}
       </div>
     );
   }
@@ -241,11 +244,11 @@ function OverviewTab({ range }: { range: DateRange }) {
   if (coreError !== null && !hasData) {
     return (
       <div className="cc-overview">
+        {throughputSection}
         <div className="cc-error" data-testid="command-center-overview-error" role="alert">
           <AlertCircle size={24} />
           <p>{coreError}</p>
         </div>
-        {throughputSection}
       </div>
     );
   }
@@ -253,17 +256,18 @@ function OverviewTab({ range }: { range: DateRange }) {
   if (!hasData) {
     return (
       <div className="cc-overview">
+        {throughputSection}
         <div className="cc-empty" data-testid="command-center-empty">
           <Gauge size={28} />
           <p>{t("commandCenter.empty", "No usage data yet. Run some agents to populate the Command Center.")}</p>
         </div>
-        {throughputSection}
       </div>
     );
   }
 
   return (
     <div className="cc-overview">
+      {throughputSection}
       <div className="cc-stat-grid">
         {cards.map((card) => (
           <div key={card.id} className="card cc-stat-card" data-testid={`command-center-stat-${card.id}`}>
@@ -370,7 +374,6 @@ function OverviewTab({ range }: { range: DateRange }) {
           ) : null}
         </section>
       ) : null}
-      {throughputSection}
     </div>
   );
 }

packages/dashboard/app/components/command-center/__tests__/CommandCenter.test.tsx

@@ -291,6 +291,17 @@ function liveMetricValue(testId = "command-center-live-tasks-in-progress") {
   return screen.getByTestId(testId).querySelector(".cc-live-metric-value")?.textContent ?? null;
 }
 
+function expectThroughputFirstBefore(...followingTestIds: string[]) {
+  const throughput = screen.getByTestId("command-center-throughput");
+  expect(throughput.parentElement?.classList.contains("cc-overview")).toBe(true);
+  expect(throughput.parentElement?.firstElementChild).toBe(throughput);
+
+  for (const testId of followingTestIds) {
+    const followingNode = screen.getByTestId(testId);
+    expect(Boolean(throughput.compareDocumentPosition(followingNode) & Node.DOCUMENT_POSITION_FOLLOWING)).toBe(true);
+  }
+}
+
 beforeEach(() => {
   apiMock.mockReset();
   mockEmptyOverviewApi();
@@ -308,6 +319,13 @@ describe("CommandCenter shell", () => {
     expect(screen.getByTestId("command-center-panel-overview")).toBeTruthy();
   });
 
+  it("renders throughput first while the Overview branch is loading", () => {
+    mockEmptyOverviewApi();
+    render(<CommandCenter />);
+    expect(screen.getByTestId("command-center-overview-loading")).toBeTruthy();
+    expectThroughputFirstBefore("command-center-overview-loading");
+  });
+
   it("renders the documented empty state when there is no data (no crash)", async () => {
     mockEmptyOverviewApi();
     render(<CommandCenter />);
@@ -317,6 +335,7 @@ describe("CommandCenter shell", () => {
     expect(screen.queryByTestId("cc-overview-pie")).toBeNull();
     expect(screen.queryByTestId("cc-overview-line")).toBeNull();
     await screen.findByTestId("command-center-empty");
+    expectThroughputFirstBefore("command-center-empty");
     expect(screen.queryByTestId("command-center-overview-charts")).toBeNull();
     expect(screen.queryByTestId("cc-overview-pie")).toBeNull();
     expect(screen.queryByTestId("cc-overview-line")).toBeNull();
@@ -352,6 +371,7 @@ describe("CommandCenter shell", () => {
     expect(statValue("command-center-stat-models")).toBe("2");
     expect(statValue("command-center-stat-signals")).toBe("2");
     expect(screen.getByTestId("command-center-live-strip")).toBeTruthy();
+    expectThroughputFirstBefore("command-center-stat-tokens", "command-center-live-strip");
     expect(screen.getByTestId("command-center-live-snapshot")).toBeTruthy();
     await waitFor(() => expect(liveMetricValue()).toBe("3"));
     expect(screen.getByTestId("command-center-live-agents-working").textContent).toContain("2");
@@ -561,6 +581,7 @@ describe("CommandCenter shell", () => {
     render(<CommandCenter />);
 
     await screen.findByTestId("command-center-overview-error");
+    expectThroughputFirstBefore("command-center-overview-error");
     expect(screen.getByTestId("command-center-overview-error").textContent).toContain("tokens failed");
     expect(screen.queryByTestId("command-center-overview-loading")).toBeNull();
     expect(screen.queryByTestId("command-center-empty")).toBeNull();