Update AreaTabs and experimenta page for educator annual pass visibility

- Disabled the educator tab in AreaTabs and added a 'Demnächst' badge for future visibility.
- Updated the experimenta page header to singular form for consistency and improved layout of ProductCard components for better readability.

These changes enhance the user experience by clarifying product availability and improving the overall presentation of the educator annual pass.

app/components/navigation/AreaTabs.vue

@@ -26,8 +26,9 @@ const areas: ProductArea[] = [
     id: 'educator',
     label: 'Pädagogen Jahreskarte',
     icon: GraduationCap,
-    enabled: true,
+    enabled: false,
     visible: true,
+    badge: 'Demnächst',
     route: '/educator',
   },
   {

app/pages/experimenta/index.vue

@@ -55,7 +55,7 @@ const getDiscount = (category: string): number | undefined => {
       <!-- Page Header -->
       <div class="mx-auto mb-12 max-w-container-wide text-center">
         <h1 class="mb-4 text-4xl font-bold text-white md:text-5xl">
-          experimenta Jahreskarten
+          experimenta Jahreskarte
         </h1>
         <p class="mx-auto max-w-2xl text-lg text-white/80">
           Erlebe die Ausstellungswelt der experimenta ein ganzes Jahr lang.
@@ -85,17 +85,10 @@ const getDiscount = (category: string): number | undefined => {
       <!-- Products Grid -->
       <div v-else-if="products && products.length > 0" class="mx-auto max-w-container-wide">
         <ProductGrid :columns="3">
-          <ProductCard
-            v-for="product in products"
-            :key="product.id"
-            image="/img/makerspace-jk-2025.jpg"
-            :title="product.name"
-            :description="product.description"
-            :price="Number(product.price)"
-            :badge="getBadge(product.category)"
-            :discount-percentage="getDiscount(product.category)"
-            :product-id="product.id"
-          />
+          <ProductCard v-for="product in products" :key="product.id" image="/img/makerspace-jk-2025.jpg"
+            :title="product.name" :description="product.description" :price="Number(product.price)"
+            :badge="getBadge(product.category)" :discount-percentage="getDiscount(product.category)"
+            :product-id="product.id" />
         </ProductGrid>
       </div>