Enhance SvelteKit project by adding new API routes for dark mode toggling, updating existing route parameters, and improving type definitions. Refactor component imports and optimize asset handling for better performance and maintainability.

src/lib/components/ui/avatar/avatar-fallback.svelte

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+<script lang="ts">
+	import { Avatar as AvatarPrimitive } from "bits-ui";
+	import { cn } from "$lib/utils.js";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		...restProps
+	}: AvatarPrimitive.FallbackProps = $props();
+</script>
+
+<AvatarPrimitive.Fallback
+	bind:ref
+	data-slot="avatar-fallback"
+	class={cn("bg-muted flex size-full items-center justify-center rounded-full", className)}
+	{...restProps}
+/>

src/lib/components/ui/avatar/avatar-image.svelte

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+<script lang="ts">
+	import { Avatar as AvatarPrimitive } from "bits-ui";
+	import { cn } from "$lib/utils.js";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		...restProps
+	}: AvatarPrimitive.ImageProps = $props();
+</script>
+
+<AvatarPrimitive.Image
+	bind:ref
+	data-slot="avatar-image"
+	class={cn("aspect-square size-full", className)}
+	{...restProps}
+/>

src/lib/components/ui/avatar/avatar.svelte

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+<script lang="ts">
+	import { Avatar as AvatarPrimitive } from "bits-ui";
+	import { cn } from "$lib/utils.js";
+
+	let {
+		ref = $bindable(null),
+		loadingStatus = $bindable("loading"),
+		class: className,
+		...restProps
+	}: AvatarPrimitive.RootProps = $props();
+</script>
+
+<AvatarPrimitive.Root
+	bind:ref
+	bind:loadingStatus
+	data-slot="avatar"
+	class={cn("relative flex size-8 shrink-0 overflow-hidden rounded-full", className)}
+	{...restProps}
+/>

src/lib/components/ui/avatar/index.ts

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+import Root from "./avatar.svelte";
+import Image from "./avatar-image.svelte";
+import Fallback from "./avatar-fallback.svelte";
+
+export {
+	Root,
+	Image,
+	Fallback,
+	//
+	Root as Avatar,
+	Image as AvatarImage,
+	Fallback as AvatarFallback,
+};

src/lib/components/ui/switch/index.ts

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+import Root from "./switch.svelte";
+
+export {
+	Root,
+	//
+	Root as Switch,
+};

src/lib/components/ui/switch/switch.svelte

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+<script lang="ts">
+	import { Switch as SwitchPrimitive } from "bits-ui";
+	import { cn, type WithoutChildrenOrChild } from "$lib/utils.js";
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		checked = $bindable(false),
+		...restProps
+	}: WithoutChildrenOrChild<SwitchPrimitive.RootProps> = $props();
+</script>
+
+<SwitchPrimitive.Root
+	bind:ref
+	bind:checked
+	data-slot="switch"
+	class={cn(
+		"data-[state=checked]:bg-primary data-[state=unchecked]:bg-input focus-visible:border-ring focus-visible:ring-ring/50 dark:data-[state=unchecked]:bg-input/80 peer inline-flex h-[1.15rem] w-8 shrink-0 items-center rounded-full border border-transparent shadow-xs transition-all outline-none focus-visible:ring-[3px] disabled:cursor-not-allowed disabled:opacity-50",
+		className
+	)}
+	{...restProps}
+>
+	<SwitchPrimitive.Thumb
+		data-slot="switch-thumb"
+		class={cn(
+			"bg-background dark:data-[state=unchecked]:bg-foreground dark:data-[state=checked]:bg-primary-foreground pointer-events-none block size-4 rounded-full ring-0 transition-transform data-[state=checked]:translate-x-[calc(100%-2px)] data-[state=unchecked]:translate-x-0"
+		)}
+	/>
+</SwitchPrimitive.Root>