Sprint: ll (#207)

* feat(PBI-ll): voeg lib/product-switch-path.ts toe met resolveProductSwitchTarget

Pure helper die doel-URL bij product-wissel bepaalt; unit-tests dekken alle pad-gevallen.

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

* test(product-switch-path): dek alle pad-categorieën en null-terugval af

* feat(nav-bar): gebruik resolveProductSwitchTarget bij product-wissel

Vervang router.refresh() door gerichte navigatie via resolveProductSwitchTarget,
zodat product/sprint/solo-pagina's direct naar het nieuwe product navigeren.

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

* 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>

---------

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)', () => {

__tests__/lib/product-switch-path.test.ts

@@ -0,0 +1,56 @@
+import { describe, it, expect } from 'vitest'
+import { resolveProductSwitchTarget } from '@/lib/product-switch-path'
+
+describe('resolveProductSwitchTarget', () => {
+  it('returns null for non-product pages', () => {
+    expect(resolveProductSwitchTarget('/dashboard', 'new-id')).toBeNull()
+    expect(resolveProductSwitchTarget('/insights', 'new-id')).toBeNull()
+    expect(resolveProductSwitchTarget('/ideas', 'new-id')).toBeNull()
+    expect(resolveProductSwitchTarget('/jobs', 'new-id')).toBeNull()
+    expect(resolveProductSwitchTarget('/', 'new-id')).toBeNull()
+  })
+
+  it('maps /products/<old> to /products/<new>', () => {
+    expect(resolveProductSwitchTarget('/products/old-id', 'new-id')).toBe('/products/new-id')
+  })
+
+  it('maps /products/<old>/ to /products/<new>', () => {
+    expect(resolveProductSwitchTarget('/products/old-id/', 'new-id')).toBe('/products/new-id')
+  })
+
+  it('maps /products/<old>/sprint to /products/<new>/sprint', () => {
+    expect(resolveProductSwitchTarget('/products/old-id/sprint', 'new-id')).toBe(
+      '/products/new-id/sprint',
+    )
+  })
+
+  it('maps /products/<old>/sprint/<sprintId> to /products/<new>/sprint', () => {
+    expect(resolveProductSwitchTarget('/products/old-id/sprint/abc123', 'new-id')).toBe(
+      '/products/new-id/sprint',
+    )
+  })
+
+  it('maps /products/<old>/sprint/.../planning to /products/<new>/sprint', () => {
+    expect(resolveProductSwitchTarget('/products/old-id/sprint/abc123/planning', 'new-id')).toBe(
+      '/products/new-id/sprint',
+    )
+  })
+
+  it('maps /products/<old>/solo to /products/<new>/solo', () => {
+    expect(resolveProductSwitchTarget('/products/old-id/solo', 'new-id')).toBe(
+      '/products/new-id/solo',
+    )
+  })
+
+  it('falls back to /products/<new> for /products/<old>/settings', () => {
+    expect(resolveProductSwitchTarget('/products/old-id/settings', 'new-id')).toBe(
+      '/products/new-id',
+    )
+  })
+
+  it('falls back to /products/<new> for unknown sub-segments', () => {
+    expect(resolveProductSwitchTarget('/products/old-id/unknown/deep', 'new-id')).toBe(
+      '/products/new-id',
+    )
+  })
+})