test(nav-bar): voeg navigatie-assertions toe voor product-wissel

Voeg 4 tests toe die verifiëren dat NavBar na product-wissel naar de
juiste URL navigeert: /products/B, /products/B/sprint, /products/B/solo,
en router.refresh() op niet-product-pagina's.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

__tests__/components/shared/nav-bar.test.tsx

@@ -111,6 +111,47 @@ describe('NavBar — product switch', () => {
     await Promise.resolve()
     expect(actionMock).toHaveBeenCalledWith('B')
   })
+
+  it('non-demo: on /products/A navigates to /products/B', async () => {
+    pathnameMock.mockReturnValue('/products/A')
+    renderNavBar({ isDemo: false, activeProductId: 'A' })
+    fireEvent.click(screen.getByText('Beta'))
+    await Promise.resolve()
+    await Promise.resolve()
+    expect(pushMock).toHaveBeenCalledWith('/products/B')
+    expect(toastSuccess).toHaveBeenCalled()
+  })
+
+  it('non-demo: on /products/A/sprint/SPR1 navigates to /products/B/sprint', async () => {
+    pathnameMock.mockReturnValue('/products/A/sprint/SPR1')
+    renderNavBar({ isDemo: false, activeProductId: 'A' })
+    fireEvent.click(screen.getByText('Beta'))
+    await Promise.resolve()
+    await Promise.resolve()
+    expect(pushMock).toHaveBeenCalledWith('/products/B/sprint')
+    expect(toastSuccess).toHaveBeenCalled()
+  })
+
+  it('non-demo: on /products/A/solo navigates to /products/B/solo', async () => {
+    pathnameMock.mockReturnValue('/products/A/solo')
+    renderNavBar({ isDemo: false, activeProductId: 'A' })
+    fireEvent.click(screen.getByText('Beta'))
+    await Promise.resolve()
+    await Promise.resolve()
+    expect(pushMock).toHaveBeenCalledWith('/products/B/solo')
+    expect(toastSuccess).toHaveBeenCalled()
+  })
+
+  it('non-demo: on /dashboard calls router.refresh and not router.push', async () => {
+    pathnameMock.mockReturnValue('/dashboard')
+    renderNavBar({ isDemo: false, activeProductId: 'A' })
+    fireEvent.click(screen.getByText('Beta'))
+    await Promise.resolve()
+    await Promise.resolve()
+    expect(refreshMock).toHaveBeenCalled()
+    expect(pushMock).not.toHaveBeenCalled()
+    expect(toastSuccess).toHaveBeenCalled()
+  })
 })
 
 describe('NavBar — URL-derived active product (demo only)', () => {