Enhance CartItem component with non-selectable elements

- Added 'select-none' class to subtotal and remove button in CartItem.vue to prevent text selection during user interaction, improving the overall user experience.

app/components/Cart/CartItem.vue

@@ -154,7 +154,7 @@ const placeholderImage = '/img/makerspace-jk-2025.jpg'
         <!-- Subtotal + Remove Button -->
         <div class="flex items-center gap-2">
           <!-- Subtotal -->
-          <div class="flex flex-col text-right">
+          <div class="flex flex-col text-right select-none">
             <div class="text-xs text-white/60 uppercase tracking-wide">
               Summe
             </div>
@@ -164,7 +164,7 @@ const placeholderImage = '/img/makerspace-jk-2025.jpg'
           </div>
 
           <!-- Remove Button (Mobile) -->
-          <Button variant="ghost" size="icon" class="sm:hidden text-white/60 hover:text-red hover:bg-red/10 h-8 w-8"
+          <Button variant="ghost" size="icon" class="sm:hidden text-white/60 hover:text-red hover:bg-red/10 h-8 w-8 select-none"
             :disabled="loading" @click="handleRemove">
             <Trash2 class="h-4 w-4" />
           </Button>