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/de.json

@@ -345,5 +345,19 @@
 	"persons_new_birth_year": "Geburtsjahr",
 	"persons_new_death_year": "Todesjahr",
 	"persons_new_notes": "Notizen",
-	"person_save_changes": "Änderungen speichern"
+	"person_save_changes": "Änderungen speichern",
+	"notification_view_all": "Alle anzeigen →",
+	"notification_history_heading": "Benachrichtigungen",
+	"notification_history_view_link": "Benachrichtigungsverlauf ansehen →",
+	"notification_filter_all": "Alle",
+	"notification_filter_unread": "Ungelesen",
+	"notification_filter_mention": "Erwähnung",
+	"notification_filter_reply": "Antwort",
+	"notification_mark_all_read_aria": "Alle Benachrichtigungen als gelesen markieren",
+	"notification_load_more": "Ältere laden",
+	"notification_empty_history": "Keine Benachrichtigungen",
+	"notification_empty_history_body": "Hier erscheinen Erwähnungen und Antworten auf deine Kommentare.",
+	"notification_row_aria": "{actor} {type} auf \u201e{title}\u201c \u2014 {time} \u2014 {readState}",
+	"notification_read_state_read": "gelesen",
+	"notification_read_state_unread": "ungelesen"
 }