Add theme selection, dark/light mode selection

app/components/ui/select/SelectScrollDownButton.vue

@@ -0,0 +1,26 @@
+<script setup lang="ts">
+import type { SelectScrollDownButtonProps } from "reka-ui"
+import type { HTMLAttributes } from "vue"
+import { reactiveOmit } from "@vueuse/core"
+import { ChevronDown } from "lucide-vue-next"
+import { SelectScrollDownButton, useForwardProps } from "reka-ui"
+import { cn } from "@/lib/utils"
+
+const props = defineProps<SelectScrollDownButtonProps & { class?: HTMLAttributes["class"] }>()
+
+const delegatedProps = reactiveOmit(props, "class")
+
+const forwardedProps = useForwardProps(delegatedProps)
+</script>
+
+<template>
+  <SelectScrollDownButton
+    data-slot="select-scroll-down-button"
+    v-bind="forwardedProps"
+    :class="cn('flex cursor-default items-center justify-center py-1', props.class)"
+  >
+    <slot>
+      <ChevronDown class="size-4" />
+    </slot>
+  </SelectScrollDownButton>
+</template>