Add theme selection, dark/light mode selection

app/components/ui/internal/ModeToggle.vue

@@ -0,0 +1,22 @@
+<script setup lang="ts">
+import { Button } from '@/components/ui/button';
+import { Moon, Sun } from 'lucide-vue-next';
+
+const colorMode = useColorMode()
+
+function toggleMode() {
+    if (colorMode.preference === 'system' || colorMode.preference === 'light') {
+        colorMode.preference = 'dark'
+    } else {
+        colorMode.preference = 'light'
+    }
+}
+</script>
+
+<template>
+    <Button variant="outline" @click="toggleMode">
+        <Moon class="h-[1.2rem] w-[1.2rem] rotate-0 scale-100 transition-all dark:-rotate-90 dark:scale-0" />
+        <Sun class="absolute h-[1.2rem] w-[1.2rem] rotate-90 scale-0 transition-all dark:rotate-0 dark:scale-100" />
+        <span class="sr-only">Toggle theme</span>
+    </Button>
+</template>