fix(review): separate note from link label in journey item stub

item.note is editorial prose — it must not be used as the anchor label.
Always show the i18n placeholder as the link text; render note as a
caption below the link when present.

Adds TODO(#786) comment so the stub degradation is tracked.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/routes/geschichten/[id]/+page.svelte

@@ -104,13 +104,17 @@ async function handleDelete() {
 			</h2>
 			<ul class="flex flex-col gap-2">
 				{#each g.items.filter((i) => i.documentId) as item (item.id)}
+					<!-- TODO(#786): replace placeholder with actual document title once journey reader is built -->
 					<li>
 						<a
 							href="/documents/{item.documentId}"
 							class="block rounded border border-line bg-surface px-4 py-3 font-serif text-base text-ink hover:bg-muted"
 						>
-							{item.note ?? m.geschichten_document_link_placeholder()}
+							{m.geschichten_document_link_placeholder()}
 						</a>
+						{#if item.note}
+							<p class="mt-1 font-sans text-sm text-ink-3">{item.note}</p>
+						{/if}
 					</li>
 				{/each}
 			</ul>