chore: merge main into feat/persons-redesign-concept-a

Resolved conflicts in messages/de.json, en.json, es.json by keeping
both the persons-redesign keys (feature branch) and the notification
keys (main) in all three locale files.

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

frontend/messages/en.json

@@ -345,5 +345,19 @@
 	"persons_new_birth_year": "Birth year",
 	"persons_new_death_year": "Death year",
 	"persons_new_notes": "Notes",
-	"person_save_changes": "Save changes"
+	"person_save_changes": "Save changes",
+	"notification_view_all": "View all →",
+	"notification_history_heading": "Notifications",
+	"notification_history_view_link": "View notification history →",
+	"notification_filter_all": "All",
+	"notification_filter_unread": "Unread",
+	"notification_filter_mention": "Mention",
+	"notification_filter_reply": "Reply",
+	"notification_mark_all_read_aria": "Mark all notifications as read",
+	"notification_load_more": "Load older",
+	"notification_empty_history": "No notifications",
+	"notification_empty_history_body": "Mentions and replies to your comments will appear here.",
+	"notification_row_aria": "{actor} {type} on \"{title}\" — {time} — {readState}",
+	"notification_read_state_read": "read",
+	"notification_read_state_unread": "unread"
 }