feat: add CartButton component for consistent cart access across views

- Introduced a new CartButton component to encapsulate cart summary functionality, improving code reusability and maintainability.
- Updated MarketPage.vue and StallView.vue to utilize the CartButton component, enhancing user navigation to the cart.
- Removed redundant cart summary code from both views, streamlining the component structure.

These changes provide a unified and consistent user experience for accessing the cart across different market views.

src/modules/market/composables/useSearchKeyboardShortcuts.ts

@@ -0,0 +1,53 @@
+import { onMounted, onUnmounted, type Ref } from 'vue'
+
+export function useSearchKeyboardShortcuts(searchInputRef: Ref<any>) {
+  const focusSearchInput = () => {
+    if (searchInputRef.value?.$el) {
+      // Access the underlying HTML input element from the Shadcn Input component
+      const inputElement = searchInputRef.value.$el.querySelector('input') || searchInputRef.value.$el
+      if (inputElement && typeof inputElement.focus === 'function') {
+        inputElement.focus()
+      }
+    }
+  }
+
+  const blurSearchInput = () => {
+    if (searchInputRef.value?.$el) {
+      const inputElement = searchInputRef.value.$el.querySelector('input') || searchInputRef.value.$el
+      if (inputElement && typeof inputElement.blur === 'function') {
+        inputElement.blur()
+      }
+    }
+  }
+
+  const handleGlobalKeydown = (event: KeyboardEvent) => {
+    // ⌘K or Ctrl+K to focus search
+    if ((event.metaKey || event.ctrlKey) && event.key === 'k') {
+      event.preventDefault()
+      focusSearchInput()
+    }
+  }
+
+  const handleSearchKeydown = (event: KeyboardEvent) => {
+    // Escape key clears search or blurs input
+    if (event.key === 'Escape') {
+      event.preventDefault()
+      return true // Signal to clear search
+    }
+    return false
+  }
+
+  onMounted(() => {
+    document.addEventListener('keydown', handleGlobalKeydown)
+  })
+
+  onUnmounted(() => {
+    document.removeEventListener('keydown', handleGlobalKeydown)
+  })
+
+  return {
+    focusSearchInput,
+    blurSearchInput,
+    handleSearchKeydown
+  }
+}