Enhance navigation and UI components for improved user experience

- Added new AppHeader and BottomNav components for better navigation across the application.
- Introduced AreaTabs for product area navigation and integrated RoleSwitcher for user role management.
- Created CartButton component to display cart status and item count.
- Implemented UserMenu with login/logout functionality and user greeting.
- Added Badge component for notifications and status indicators.
- Updated layout to accommodate new navigation components and ensure mobile responsiveness.
- Created product detail demo page to showcase design patterns and features.
- Enhanced existing components with improved styling and functionality.

app/components/ui/badge/Badge.vue

@@ -0,0 +1,24 @@
+<script setup lang="ts">
+import { type HTMLAttributes, computed } from 'vue'
+import { type BadgeVariants, badgeVariants } from '.'
+import { cn } from '@/lib/utils'
+
+interface Props {
+  variant?: BadgeVariants['variant']
+  class?: HTMLAttributes['class']
+}
+
+const props = defineProps<Props>()
+
+const delegatedProps = computed(() => {
+  const { class: _, ...delegated } = props
+
+  return delegated
+})
+</script>
+
+<template>
+  <div :class="cn(badgeVariants({ variant }), props.class)" v-bind="delegatedProps">
+    <slot />
+  </div>
+</template>