refactor(settings/user-lifecycle): flat policy fields, danger stays in card

Drops the wrapping details-card around the inactivity-policy fields so
they read like the email page (flat grid, no extra chrome). The
"Run lifecycle now" danger action keeps its details-card so the
destructive button stays visually separated from the form inputs.
The redundant info blockquote that paraphrased the field labels is gone.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

i18n/default_de.json

@@ -509,6 +509,7 @@
   "Inactive tenants are excluded from user access and tenant-scoped data.": "Inaktive Mandanten werden vom Benutzerzugriff und mandantenspezifischen Daten ausgeschlossen.",
   "Inactive users": "Inaktive Benutzer",
   "Inactivity deactivation and deletion policy": "Richtlinie für Inaktivitäts-Deaktivierung und Löschung",
+  "Inactivity policy": "Inaktivitätsrichtlinie",
   "Incomplete": "Unvollständig",
   "Inherit global default": "Globalen Standard verwenden",
   "Internal Server Error": "Interner Serverfehler",

i18n/default_en.json

@@ -509,6 +509,7 @@
   "Inactive tenants are excluded from user access and tenant-scoped data.": "Inactive tenants are excluded from user access and tenant-scoped data.",
   "Inactive users": "Inactive users",
   "Inactivity deactivation and deletion policy": "Inactivity deactivation and deletion policy",
+  "Inactivity policy": "Inactivity policy",
   "Incomplete": "Incomplete",
   "Inherit global default": "Inherit global default",
   "Internal Server Error": "Internal Server Error",