feat(ST-905): add Activeer button per product row in dashboard and product header

app/(app)/dashboard/page.tsx

@@ -16,10 +16,15 @@ export default async function DashboardPage({ searchParams }: Props) {
   const { archived } = await searchParams
   const showArchived = archived === '1'
 
-  const products = await prisma.product.findMany({
-    where: { archived: showArchived, ...productAccessFilter(session.userId) },
-    orderBy: { created_at: 'desc' },
-  })
+  const [products, user] = await Promise.all([
+    prisma.product.findMany({
+      where: { archived: showArchived, ...productAccessFilter(session.userId) },
+      orderBy: { created_at: 'desc' },
+    }),
+    session.userId
+      ? prisma.user.findUnique({ where: { id: session.userId }, select: { active_product_id: true } })
+      : null,
+  ])
 
   return (
     <div className="p-6 max-w-4xl mx-auto w-full">
@@ -47,6 +52,7 @@ export default async function DashboardPage({ searchParams }: Props) {
         products={products}
         isDemo={session.isDemo ?? false}
         showArchived={showArchived}
+        activeProductId={user?.active_product_id ?? null}
       />
     </div>
   )

app/(app)/products/[id]/page.tsx

@@ -7,6 +7,7 @@ import { PbiList } from '@/components/backlog/pbi-list'
 import { StoryPanel } from '@/components/backlog/story-panel'
 import type { Story } from '@/components/backlog/story-panel'
 import { StartSprintButton } from '@/components/sprint/start-sprint-button'
+import { ActivateProductButton } from '@/components/shared/activate-product-button'
 import Link from 'next/link'
 
 interface Props {
@@ -21,9 +22,10 @@ export default async function ProductBacklogPage({ params }: Props) {
   const product = await getAccessibleProduct(id, session.userId)
   if (!product) notFound()
 
-  const activeSprint = await prisma.sprint.findFirst({
-    where: { product_id: id, status: 'ACTIVE' },
-  })
+  const [activeSprint, user] = await Promise.all([
+    prisma.sprint.findFirst({ where: { product_id: id, status: 'ACTIVE' } }),
+    prisma.user.findUnique({ where: { id: session.userId! }, select: { active_product_id: true } }),
+  ])
 
   const pbis = await prisma.pbi.findMany({
     where: { product_id: id },
@@ -66,6 +68,9 @@ export default async function ProductBacklogPage({ params }: Props) {
           )}
         </div>
         <div className="flex items-center gap-3">
+          {user?.active_product_id !== id && (
+            <ActivateProductButton productId={id} isDemo={isDemo} />
+          )}
           {activeSprint ? (
             <Link href={`/products/${id}/sprint`} className="text-xs text-primary hover:underline font-medium">
               Sprint actief →

components/dashboard/product-list.tsx

@@ -5,8 +5,10 @@ import { useRouter } from 'next/navigation'
 import { useTransition } from 'react'
 import { toast } from 'sonner'
 import { Button } from '@/components/ui/button'
+import { Badge } from '@/components/ui/badge'
 import { CodeBadge } from '@/components/shared/code-badge'
 import { restoreProductAction } from '@/actions/products'
+import { setActiveProductAction } from '@/actions/active-product'
 
 interface Product {
   id: string
@@ -20,9 +22,10 @@ interface ProductListProps {
   products: Product[]
   isDemo: boolean
   showArchived?: boolean
+  activeProductId: string | null
 }
 
-export function ProductList({ products, isDemo, showArchived = false }: ProductListProps) {
+export function ProductList({ products, isDemo, showArchived = false, activeProductId }: ProductListProps) {
   const router = useRouter()
   const [, startTransition] = useTransition()
 
@@ -34,6 +37,15 @@ export function ProductList({ products, isDemo, showArchived = false }: ProductL
     })
   }
 
+  function handleActivate(id: string) {
+    if (isDemo) { toast.error('Niet beschikbaar in demo-modus'); return }
+    startTransition(async () => {
+      const result = await setActiveProductAction(id)
+      if (result?.error) toast.error(typeof result.error === 'string' ? result.error : 'Activeren mislukt')
+      else router.push(`/products/${id}`)
+    })
+  }
+
   if (products.length === 0) {
     return (
       <div className="bg-surface-container-low rounded-xl border border-border p-12 text-center space-y-3">
@@ -87,6 +99,18 @@ export function ProductList({ products, isDemo, showArchived = false }: ProductL
                   Repo
                 </a>
               )}
+              {!showArchived && (
+                product.id === activeProductId
+                  ? <Badge className="bg-primary-container text-primary-container-foreground text-xs px-2 py-0">Actief</Badge>
+                  : (
+                    <button
+                      onClick={(e) => { e.stopPropagation(); handleActivate(product.id) }}
+                      className="text-xs text-primary hover:underline"
+                    >
+                      Activeer
+                    </button>
+                  )
+              )}
               {showArchived && !isDemo && (
                 <button
                   onClick={(e) => { e.stopPropagation(); handleRestore(product.id) }}

components/shared/activate-product-button.tsx

@@ -0,0 +1,35 @@
+'use client'
+
+import { useRouter } from 'next/navigation'
+import { useTransition } from 'react'
+import { toast } from 'sonner'
+import { setActiveProductAction } from '@/actions/active-product'
+
+interface Props {
+  productId: string
+  isDemo: boolean
+}
+
+export function ActivateProductButton({ productId, isDemo }: Props) {
+  const router = useRouter()
+  const [isPending, startTransition] = useTransition()
+
+  function handleActivate() {
+    if (isDemo) { toast.error('Niet beschikbaar in demo-modus'); return }
+    startTransition(async () => {
+      const result = await setActiveProductAction(productId)
+      if (result?.error) toast.error(typeof result.error === 'string' ? result.error : 'Activeren mislukt')
+      else router.push(`/products/${productId}`)
+    })
+  }
+
+  return (
+    <button
+      onClick={handleActivate}
+      disabled={isPending}
+      className="text-xs text-primary hover:underline font-medium disabled:opacity-50"
+    >
+      Activeer
+    </button>
+  )
+}