layout displays form action result messages

src/routes/+layout.svelte

@@ -0,0 +1,13 @@
+<script lang="ts">
+	import {page} from '$app/stores'
+
+	$: console.log('form in layout:', $page.form)
+</script>
+
+{#if $page.form?.message}
+	<p class="message" class:error={!!$page.form.error} class:success={!!$page.form.success}>
+		{$page.form.message}
+	</p>
+{/if}
+
+<slot/>