style(#145): bump dashboard widget content links to text-lg

Box content links (document titles, actor names) raised from text-sm to
text-lg for improved readability and touch target size. "Show all" stays
at text-sm to maintain hierarchy — box links are the primary action.

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

frontend/src/lib/components/DashboardRecentDocuments.svelte

@@ -34,7 +34,7 @@ function formatDate(dateStr: string): string {
 			<div class="flex items-center justify-between border-b border-line py-2 last:border-0">
 				<a
 					href="/documents/{doc.id}"
-					class="font-serif text-sm text-ink hover:text-ink-2 hover:underline"
+					class="font-serif text-lg text-ink hover:text-ink-2 hover:underline"
 				>
 					{doc.title}
 				</a>