feat(260929-if2): faellige Erinnerungen erledigen, spaeter erinnern, bearbeiten und loeschen

- API: Aendern (409 wenn faellig), Spaeter erinnern (409 wenn nicht faellig, setzt E-Mail-Spur zurueck), Loeschen; fremde Kennungen 404
- Kachel: faellige Zeilen hervorgehoben mit Erledigt und drei Spaeter-Optionen, kuenftige mit Bearbeiten und Loeschen
- Zeit-Hilfen (morgen zur gleichen Uhrzeit), Zugriffsklassifikation nachgemessen

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

apps/web/src/messages/en.json

@@ -493,6 +493,21 @@
       "saveError": "The reminder could not be saved.",
       "loadError": "Reminders could not be loaded.",
       "limitReached": "You can have at most 100 reminders.",
+      "due": "Due",
+      "done": "Done",
+      "snooze": "Remind me later",
+      "snooze10m": "In 10 minutes",
+      "snooze1h": "In 1 hour",
+      "snoozeTomorrow": "Tomorrow at {time}",
+      "edit": "Edit reminder",
+      "editTitle": "Edit reminder",
+      "delete": "Delete reminder",
+      "deleteConfirm": "Delete?",
+      "yes": "Yes",
+      "no": "No",
+      "alreadyDue": "The reminder is now due and can no longer be edited.",
+      "notDue": "The reminder is not due yet.",
+      "permissionDenied": "Your browser blocks notifications. Due reminders will then only appear here in the tile.",
       "notificationTitle": "Reminder: {title}"
     },
     "editShort": "Edit",