fix(copy): real-data follow-up to #3471 (v3)

frontend/src/__tests__/components/demo-banner.test.tsx

@@ -9,13 +9,13 @@ import { DemoBanner } from '@/components/control-plane/demo-banner';
 describe('DemoBanner Component', () => {
     it('renders when visible=true', () => {
         render(<DemoBanner visible={true} />);
-        expect(screen.getByText('Sample Data')).toBeInTheDocument();
+        expect(screen.getByText('No data yet')).toBeInTheDocument();
     });
 
-    it('shows "Sample Data" text and description', () => {
+    it('shows the empty-state text and a next-step link', () => {
         render(<DemoBanner visible={true} />);
-        expect(screen.getByText('Sample Data')).toBeInTheDocument();
-        expect(screen.getByText(/backend unavailable/i)).toBeInTheDocument();
+        expect(screen.getByText('No data yet')).toBeInTheDocument();
+        expect(screen.getByRole('link', { name: /connect real data/i })).toHaveAttribute('href', '/ingest');
     });
 
     it('does not render when visible=false', () => {

frontend/src/__tests__/pages/dashboard-navigation.test.tsx

@@ -67,20 +67,14 @@ describe('Dashboard navigation discoverability', () => {
         expect(screen.queryByText('All Systems Operational')).not.toBeInTheDocument();
     });
 
-    it('exposes Inflow Lab as a top-level active dashboard link', async () => {
+    it('does not surface Inflow Lab in the dashboard navigation', async () => {
         render(
             <DashboardLayout>
                 <div>Inflow content</div>
             </DashboardLayout>,
         );
 
-        const inflowLink = screen
-            .getAllByText('Inflow Lab')
-            .map((node) => node.closest('a'))
-            .find((link) => link?.getAttribute('aria-current') === 'page');
-        expect(inflowLink).not.toBeNull();
-        expect(inflowLink).toHaveAttribute('href', '/dashboard/inflow-lab');
-        expect(inflowLink).toHaveAttribute('aria-current', 'page');
+        expect(screen.queryByText('Inflow Lab')).not.toBeInTheDocument();
         expect(screen.getByRole('button', { name: /Intake/i })).toBeInTheDocument();
         expect(screen.getAllByText('Document Ingestion')[0].closest('a')).toHaveAttribute('href', '/ingest');
     });