fix(#145): dashboard notification widget shows all recent notifications

- Add type-only filter to notification repo/service (previously only
  worked with type+read=false together)
- Dashboard widget now fetches all recent notifications (mentions +
  replies, both read and unread) instead of unread mentions only
- Update component heading and show type label per row

Root cause: Berit's mentions were read=true, so the unread-only filter
returned 0 results. The recent docs widget had no REVIEWED documents
because 'marking ready' sets metadata_complete, not status=REVIEWED.
Recent docs now shows all uploads without a status filter.

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

frontend/src/lib/components/DashboardMentions.svelte

@@ -18,7 +18,7 @@ let { mentions }: Props = $props();
 {#if mentions.length > 0}
 	<div data-testid="dashboard-mentions" class="rounded-sm border border-line bg-surface p-6">
 		<h2 class="mb-4 font-sans text-xs font-bold tracking-widest text-gray-400 uppercase">
-			Erwähnungen
+			Benachrichtigungen
 		</h2>
 		{#each mentions as mention (mention.id)}
 			<div class="flex items-center gap-3 border-b border-line py-2 last:border-0">
@@ -28,6 +28,9 @@ let { mentions }: Props = $props();
 						class="font-serif text-sm text-ink hover:text-ink-2"
 					>
 						{mention.actorName ?? ''}
+						{#if mention.type === 'MENTION'}<span class="ml-1 font-sans text-xs text-gray-400"
+								>erwähnt Sie</span
+							>{:else}<span class="ml-1 font-sans text-xs text-gray-400">hat geantwortet</span>{/if}
 					</a>
 				{:else}
 					<span class="font-serif text-sm text-ink">{mention.actorName ?? ''}</span>