feat: add dashboard shell and shared components

src/lib/components/search-form.svelte

@@ -0,0 +1,21 @@
+<script lang="ts">
+	import { Label } from "$lib/components/ui/label/index.js";
+	import * as Sidebar from "$lib/components/ui/sidebar/index.js";
+	import type { WithElementRef } from "$lib/utils.js";
+	import SearchIcon from "@lucide/svelte/icons/search";
+	import type { HTMLFormAttributes } from "svelte/elements";
+
+	let { ref = $bindable(null), ...restProps }: WithElementRef<HTMLFormAttributes> = $props();
+</script>
+
+<form bind:this={ref} {...restProps}>
+	<Sidebar.Group class="py-0">
+		<Sidebar.GroupContent class="relative">
+			<Label for="search" class="sr-only">Search</Label>
+			<Sidebar.Input id="search" placeholder="Search the docs..." class="ps-8" />
+			<SearchIcon
+				class="pointer-events-none absolute start-2 top-1/2 size-4 -translate-y-1/2 opacity-50 select-none"
+			/>
+		</Sidebar.GroupContent>
+	</Sidebar.Group>
+</form>