Add FamDone Brand component

frontend/src/lib/components/AuthShell.svelte

@@ -1,5 +1,11 @@
 <script lang="ts">
-	let { title, subtitle, children }: {
+	import FamDone from './FamDone.svelte';
+
+	let {
+		title,
+		subtitle,
+		children
+	}: {
 		title: string;
 		subtitle?: string;
 		children?: any;
@@ -7,7 +13,7 @@
 </script>
 
 <main class="auth">
-	<a class="brand" href="/">FamChore</a>
+	<a class="brand" href="/"><FamDone /></a>
 	<div class="card">
 		<h1>{title}</h1>
 		{#if subtitle}
@@ -26,7 +32,10 @@
 		justify-content: center;
 		padding: 2rem 1rem;
 		background: linear-gradient(135deg, #eef2ff 0%, #ffffff 55%, #eef2ff 100%);
-		font-family: system-ui, -apple-system, sans-serif;
+		font-family:
+			system-ui,
+			-apple-system,
+			sans-serif;
 		color: #1f2937;
 	}
 	.brand {
@@ -56,6 +65,8 @@
 		line-height: 1.5;
 	}
 	@media (max-width: 480px) {
-		.card { padding: 1.5rem; }
+		.card {
+			padding: 1.5rem;
+		}
 	}
 </style>