add WIP design

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
+	class={cn("bg-muted flex h-full w-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
+	class={cn("aspect-square h-full w-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),
+		class: className,
+		...restProps
+	}: AvatarPrimitive.RootProps = $props();
+</script>
+
+<AvatarPrimitive.Root
+	bind:ref
+	class={cn("relative flex size-10 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,
+};