Enhance Role-Based Visibility and Navigation Logic

- Introduced role visibility checks in AreaTabs.vue to filter displayed areas based on the user's active role, improving user experience and accessibility.
- Updated RoleSwitcher.vue to enhance accessibility with a high-contrast checkmark for better visibility.
- Modified useActiveRole.ts to streamline role initialization and refresh logic for role-based product visibility.
- Added explicit keys for role-based data fetching in product-related pages to ensure accurate data refresh.
- Enhanced API endpoint for product retrieval to return 404 if a product is not accessible based on the user's role, ensuring security and clarity.

app/components/navigation/AreaTabs.vue

@@ -3,6 +3,8 @@ import { Wrench, FlaskConical, Ticket, Sparkles, GraduationCap, Home } from 'luc
 import { Tabs, TabsList, TabsTrigger } from '@/components/ui/tabs'
 import { Badge } from '@/components/ui/badge'
 
+type RoleCode = 'private' | 'educator' | 'company'
+
 interface ProductArea {
   id: string
   label: string
@@ -11,6 +13,7 @@ interface ProductArea {
   visible: boolean
   badge?: string
   route: string
+  roleVisibility?: 'all' | RoleCode[]
 }
 
 const areas: ProductArea[] = [
@@ -21,6 +24,7 @@ const areas: ProductArea[] = [
     enabled: true,
     visible: true,
     route: '/',
+    roleVisibility: 'all',
   },
   {
     id: 'makerspace',
@@ -29,6 +33,7 @@ const areas: ProductArea[] = [
     enabled: true,
     visible: true,
     route: '/products',
+    roleVisibility: 'all',
   },
   {
     id: 'educator',
@@ -38,6 +43,7 @@ const areas: ProductArea[] = [
     visible: true,
     badge: 'Demnächst',
     route: '/educator',
+    roleVisibility: ['educator'],
   },
   {
     id: 'experimenta',
@@ -47,6 +53,7 @@ const areas: ProductArea[] = [
     visible: true,
     badge: 'Demnächst',
     route: '/experimenta',
+    roleVisibility: 'all',
   },
   {
     id: 'labs',
@@ -56,22 +63,41 @@ const areas: ProductArea[] = [
     visible: false,
     badge: 'Demnächst',
     route: '/labs',
+    roleVisibility: ['educator', 'company'],
   },
 ]
 
 const route = useRoute()
+const { activeRole } = useActiveRole()
+
+// Filter areas by role visibility
+const visibleAreas = computed(() => {
+  return areas.filter(area => {
+    // Legacy visible flag check
+    if (!area.visible) return false
+
+    // No role requirement = visible to all (backward compatible)
+    if (!area.roleVisibility) return true
+
+    // Explicitly set to 'all'
+    if (area.roleVisibility === 'all') return true
+
+    // Check if user's active role matches
+    return area.roleVisibility.includes(activeRole.value as RoleCode)
+  })
+})
 
 const currentArea = computed(() => {
-  // Determine current area based on route - check areas array dynamically
+  // Determine current area based on route - check visibleAreas array dynamically
   const currentPath = route.path
 
   // Exact match for root path
   if (currentPath === '/') {
-    return areas.find(area => area.route === '/')?.id || ''
+    return visibleAreas.value.find(area => area.route === '/')?.id || ''
   }
 
   // Find area where route path starts with area.route
-  const matchedArea = areas.find(area =>
+  const matchedArea = visibleAreas.value.find(area =>
     area.route !== '/' && currentPath.startsWith(area.route)
   )
 
@@ -90,7 +116,7 @@ function navigateToArea(area: ProductArea) {
     <!-- Desktop: Tabs -->
     <Tabs :model-value="currentArea" class="hidden md:block">
       <TabsList class="h-auto p-2 bg-white/5">
-        <TabsTrigger v-for="area in areas.filter(area => area.visible)" :key="area.id" :value="area.id"
+        <TabsTrigger v-for="area in visibleAreas" :key="area.id" :value="area.id"
           :disabled="!area.enabled" :class="[
             'gap-2 py-3 md:py-4 data-[state=active]:bg-accent data-[state=active]:text-white data-[state=active]:shadow-md',
             !area.enabled && 'opacity-50 cursor-not-allowed',
@@ -112,7 +138,7 @@ function navigateToArea(area: ProductArea) {
     <!-- Mobile: Horizontal scroll with cards (matching desktop styling) -->
     <div class="md:hidden overflow-x-auto scrollbar-hide">
       <div class="inline-flex h-auto items-center justify-center rounded-[35px] bg-white/5 p-2 min-w-max">
-        <button v-for="area in areas.filter(area => area.visible)" :key="area.id" :disabled="!area.enabled" :class="[
+        <button v-for="area in visibleAreas" :key="area.id" :disabled="!area.enabled" :class="[
           'inline-flex items-center justify-center gap-2 whitespace-nowrap rounded-[25px] px-4 py-3 text-lg font-medium transition-all focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-accent focus-visible:ring-offset-0',
           currentArea === area.id
             ? 'bg-accent text-white shadow-md'

app/components/navigation/RoleSwitcher.vue

@@ -83,7 +83,7 @@ async function handleRoleSwitch(roleCode: string, hasRole: boolean) {
       </Alert>
 
       <DropdownMenuLabel class="text-sm font-normal text-muted-foreground py-3">
-        Ich kaufe als...
+        Du kaufst als...
       </DropdownMenuLabel>
       <DropdownMenuSeparator />
 
@@ -103,8 +103,13 @@ async function handleRoleSwitch(roleCode: string, hasRole: boolean) {
           </span>
         </div>
 
-        <!-- Checkmark if active -->
-        <Check v-if="activeRole === role.code && role.hasRole" class="h-5 w-5 text-success flex-shrink-0" />
+        <!-- High-contrast checkmark for colorblind accessibility -->
+        <div v-if="activeRole === role.code && role.hasRole" class="relative flex-shrink-0">
+          <!-- Background circle for contrast -->
+          <div class="absolute inset-0 bg-white dark:bg-gray-900 rounded-full opacity-90"></div>
+          <!-- Checkmark icon with high contrast -->
+          <Check class="h-5 w-5 text-gray-900 dark:text-white relative z-10" />
+        </div>
 
         <!-- Badge if not approved -->
         <Badge v-if="!role.hasRole" variant="secondary" class="text-xs px-2 py-0.5 flex-shrink-0">

app/composables/useActiveRole.ts

@@ -36,7 +36,6 @@ export function useActiveRole() {
   const roleChangedByAdmin = useState<boolean>('roleChangedByAdmin', () => false)
   const loading = useState<boolean>('roleLoading', () => false)
   const error = useState<string | null>('roleError', () => null)
-  const initialized = useState<boolean>('roleInitialized', () => false)
 
   /**
    * Fetch current role status from server
@@ -88,8 +87,13 @@ export function useActiveRole() {
       activeRole.value = roleCode
       roleChangedByAdmin.value = false
 
-      // Refresh products if on products page
-      await refreshNuxtData('products')
+      // Refresh all product list pages (role-based visibility)
+      // Note: Product detail pages will handle visibility via API 404 check
+      await Promise.all([
+        refreshNuxtData('products-list'), // Main products page
+        refreshNuxtData('educator-products'), // Educator products page
+        refreshNuxtData('experimenta-products'), // Experimenta products page
+      ])
 
       return true
     } catch (err: any) {
@@ -112,17 +116,13 @@ export function useActiveRole() {
   const hasMultipleRoles = computed(() => approvedRoles.value.length > 1)
 
   /**
-   * Auto-initialize on first use (fetch role status from server)
-   * This ensures the role is correct immediately after login
+   * Auto-fetch roles when user logs in
+   * This ensures the role button shows the correct role immediately after login
+   * Uses callOnce to prevent redundant API calls
    */
   const { loggedIn } = useUserSession()
-  if (!initialized.value && loggedIn.value) {
-    initialized.value = true
-    // Fetch initial role status (don't await to avoid blocking)
-    fetchRoleStatus().catch((err) => {
-      // Silent fail - user can still use the app with default role
-      console.warn('Failed to initialize role status:', err)
-    })
+  if (loggedIn.value) {
+    callOnce('init-roles', () => fetchRoleStatus())
   }
 
   return {

app/pages/educator/index.vue

@@ -27,6 +27,7 @@ interface Product {
 
 // Fetch products from API - only educator passes
 const { data: products, error, pending } = await useFetch<Product[]>('/api/products', {
+  key: 'educator-products', // Explicit key for role-based refresh
   query: {
     category: 'educator-annual-pass',
   },

app/pages/experimenta/index.vue

@@ -27,6 +27,7 @@ interface Product {
 
 // Fetch products from API - only experimenta passes
 const { data: products, error, pending } = await useFetch<Product[]>('/api/products', {
+  key: 'experimenta-products', // Explicit key for role-based refresh
   query: {
     category: 'annual-pass',
   },

app/pages/products/[id].vue

@@ -33,7 +33,24 @@ interface Product {
 }
 
 // Fetch product from API
-const { data: product, error, pending } = await useFetch<Product>(`/api/products/${productId}`)
+const { data: product, error, pending } = await useFetch<Product>(`/api/products/${productId}`, {
+  key: `product-${productId}`, // Explicit key for role-based refresh
+})
+
+// Auto-redirect to products list if 404 (e.g., after role switch)
+watch(error, (newError) => {
+  if (newError?.statusCode === 404) {
+    // Show notification
+    toast.error('Produkt nicht verfügbar', {
+      description: 'Dieses Produkt ist für deine aktuelle Rolle nicht sichtbar.',
+    })
+
+    // Redirect after short delay
+    setTimeout(() => {
+      navigateTo('/products')
+    }, 1500)
+  }
+})
 
 // Format price in EUR
 const formattedPrice = computed(() => {

app/pages/products/index.vue

@@ -27,6 +27,7 @@ interface Product {
 
 // Fetch products from API - only Makerspace and Educator passes
 const { data: products, error, pending } = await useFetch<Product[]>('/api/products', {
+  key: 'products-list', // Explicit key for role-based refresh
   query: {
     category: 'makerspace-annual-pass,educator-annual-pass',
   },