Preserve originating views through detail navigation

src/lib/ui/components/BackLink.svelte

@@ -0,0 +1,13 @@
+<script lang="ts">
+    import { page } from '$app/stores';
+    import { returnLabel, safeReturnHref } from '$lib/navigation-context.js';
+    let { fallback }: { fallback: string } = $props();
+    const href = $derived(safeReturnHref($page.url.searchParams.get('returnTo'), fallback));
+</script>
+
+<a class="back-link" {href}>← {returnLabel(href)}</a>
+
+<style>
+    .back-link { display: inline-block; align-self: start; width: fit-content; font-size: var(--text-sm); color: var(--accent-primary-hover); text-decoration: none; }
+    .back-link:hover { text-decoration: underline; }
+</style>