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/routes/+page.server.ts

@@ -58,13 +58,9 @@ export async function load({ url, fetch }) {
 
 		if (isDashboard) {
 			const [mentionsResult, incompleteResult, recentResult] = await Promise.allSettled([
-				api.GET('/api/notifications', {
-					params: { query: { type: 'MENTION', read: false, size: 5 } }
-				}),
+				api.GET('/api/notifications', { params: { query: { size: 5 } } }),
 				api.GET('/api/documents/incomplete', { params: { query: { size: 5 } } }),
-				api.GET('/api/documents/search', {
-					params: { query: { status: 'REVIEWED' } }
-				})
+				api.GET('/api/documents/search', { params: { query: {} } })
 			]);
 
 			if (mentionsResult.status === 'fulfilled' && mentionsResult.value.response.ok) {