docs(spec): add /documents page design spec with mobile breakpoints

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

frontend/src/lib/components/DashboardActivityFeed.svelte

@@ -34,8 +34,10 @@ function formatDate(iso: string): string {
 		<h2 class="font-sans text-xs font-bold tracking-widest text-ink-3 uppercase">
 			{m.feed_caption()}
 		</h2>
-		<a href="/documents" class="font-sans text-xs text-ink-3 transition-colors hover:text-ink"
-			>Alle →</a
+		<a
+			href="/documents"
+			aria-label={m.feed_show_all()}
+			class="font-sans text-xs text-ink-3 transition-colors hover:text-ink">{m.feed_show_all()}</a
 		>
 	</div>
 
@@ -61,7 +63,7 @@ function formatDate(iso: string): string {
 								<strong>{item.actor.name ?? item.actor.initials}</strong>
 							{/if}
 							{verb(item.kind)}
-							<a href="/documents/{item.documentId}" class="underline hover:text-accent">
+							<a href="/documents/{item.documentId}" class="underline hover:text-ink">
 								{item.documentTitle}
 							</a>
 							{#if item.youMentioned}