feat(ui): Implement Dropdown Menu components for language switcher

- Add DropdownMenu, DropdownMenuTrigger, DropdownMenuContent, and DropdownMenuItem components
- Refactor LanguageSwitcher to use new Dropdown Menu components
- Update Navbar to use LanguageSwitcher component with improved language selection UI
- Remove legacy language toggle logic from Navbar

src/components/ui/dropdown-menu/DropdownMenu.vue

@@ -0,0 +1,17 @@
+<script setup lang="ts">
+import { DropdownMenuRoot } from 'radix-vue'
+
+defineOptions({
+  name: 'DropdownMenu'
+})
+
+defineSlots<{
+  default?: (props: {}) => any
+}>()
+</script>
+
+<template>
+  <DropdownMenuRoot v-bind="$attrs">
+    <slot />
+  </DropdownMenuRoot>
+</template> 

src/components/ui/dropdown-menu/DropdownMenuContent.vue

@@ -0,0 +1,31 @@
+<script setup lang="ts">
+import { DropdownMenuContent, type DropdownMenuContentProps } from 'radix-vue'
+import { cn } from '@/lib/utils'
+
+defineOptions({
+  name: 'DropdownMenuContent'
+})
+
+const props = withDefaults(
+  defineProps<DropdownMenuContentProps & {
+    class?: string
+  }>(),
+  {
+    sideOffset: 4,
+    align: 'start',
+    class: ''
+  }
+)
+</script>
+
+<template>
+  <DropdownMenuContent
+    :class="cn(
+      'z-50 min-w-[8rem] overflow-hidden rounded-md border bg-popover p-1 text-popover-foreground shadow-md data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95 data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2',
+      props.class
+    )"
+    v-bind="{ ...props, ...$attrs }"
+  >
+    <slot />
+  </DropdownMenuContent>
+</template> 

src/components/ui/dropdown-menu/DropdownMenuItem.vue

@@ -0,0 +1,34 @@
+<script setup lang="ts">
+import { DropdownMenuItem, type DropdownMenuItemProps } from 'radix-vue'
+import { cn } from '@/lib/utils'
+
+defineOptions({
+  name: 'DropdownMenuItem'
+})
+
+const props = withDefaults(
+  defineProps<
+    DropdownMenuItemProps & {
+      class?: string
+      inset?: boolean
+    }
+  >(),
+  {
+    class: '',
+    inset: false
+  }
+)
+</script>
+
+<template>
+  <DropdownMenuItem
+    :class="cn(
+      'relative flex cursor-default select-none items-center rounded-sm px-2 py-1.5 text-sm outline-none transition-colors focus:bg-accent focus:text-accent-foreground data-[disabled]:pointer-events-none data-[disabled]:opacity-50',
+      inset && 'pl-8',
+      props.class
+    )"
+    v-bind="{ ...props, ...$attrs }"
+  >
+    <slot />
+  </DropdownMenuItem>
+</template> 

src/components/ui/dropdown-menu/DropdownMenuTrigger.vue

@@ -0,0 +1,22 @@
+<script setup lang="ts">
+import { DropdownMenuTrigger } from 'radix-vue'
+
+defineOptions({
+  name: 'DropdownMenuTrigger'
+})
+
+const props = withDefaults(
+  defineProps<{
+    asChild?: boolean
+  }>(),
+  {
+    asChild: false
+  }
+)
+</script>
+
+<template>
+  <DropdownMenuTrigger v-bind="{ ...props, ...$attrs }">
+    <slot />
+  </DropdownMenuTrigger>
+</template> 

src/components/ui/dropdown-menu/index.ts

@@ -0,0 +1,4 @@
+export { default as DropdownMenu } from './DropdownMenu.vue'
+export { default as DropdownMenuTrigger } from './DropdownMenuTrigger.vue'
+export { default as DropdownMenuContent } from './DropdownMenuContent.vue'
+export { default as DropdownMenuItem } from './DropdownMenuItem.vue'