style: convert add topic into shadcn combobox

packages/web/src/lib/components/ui/command/command-empty.svelte

@@ -0,0 +1,12 @@
+<script lang="ts">
+	import { Command as CommandPrimitive } from "cmdk-sv";
+	import { cn } from "$lib/utils.js";
+
+	type $$Props = CommandPrimitive.EmptyProps;
+	let className: string | undefined | null = undefined;
+	export { className as class };
+</script>
+
+<CommandPrimitive.Empty class={cn("py-6 text-center text-sm", className)} {...$$restProps}>
+	<slot />
+</CommandPrimitive.Empty>