Add key signup, improve message listening

src/lib/components/Delay.svelte

@@ -0,0 +1,11 @@
+<script lang="ts">
+  import {sleep} from '@welshman/lib'
+
+  export let delay = 1
+</script>
+
+{#await sleep(delay)}
+  <!-- pass -->
+{:then}
+  <slot />
+{/await}