feat: add cart summary button to StallView for improved user navigation

- Introduced a cart summary button in StallView.vue that displays the total number of items in the cart.
- Implemented a click handler to navigate users to the cart page, enhancing the shopping experience.
- Imported the ShoppingCart icon from lucide-vue-next for visual representation.

These changes provide users with quick access to their cart, improving overall usability and navigation within the market interface.

src/modules/market/views/StallView.vue

@@ -130,6 +130,13 @@
       @add-to-cart="handleAddToCart"
     />
 
+    <!-- Cart Summary -->
+    <div v-if="marketStore.totalCartItems > 0" class="fixed bottom-4 right-4">
+      <Button @click="viewCart" class="shadow-lg">
+        <ShoppingCart class="w-5 h-5 mr-2" />
+        Cart ({{ marketStore.totalCartItems }})
+      </Button>
+    </div>
   </div>
 </template>
 
@@ -147,7 +154,7 @@ import {
   SelectTrigger,
   SelectValue,
 } from '@/components/ui/select'
-import { ArrowLeft, Store, X } from 'lucide-vue-next'
+import { ArrowLeft, Store, X, ShoppingCart } from 'lucide-vue-next'
 import FuzzySearch from '@/components/ui/fuzzy-search/FuzzySearch.vue'
 import ProductGrid from '../components/ProductGrid.vue'
 import type { Product, Stall } from '../types/market'
@@ -273,6 +280,10 @@ const handleAddToCart = (product: Product, quantity?: number) => {
   marketStore.addToStallCart(product, quantity || 1)
 }
 
+const viewCart = () => {
+  router.push('/cart')
+}
+
 
 const viewStall = (otherStallId: string) => {
   if (otherStallId !== stallId.value) {