fix(i18n): use Settings.roles namespace in settings-overview

The identity card at the top of the Settings overview was calling
useTranslations('roles') (root-level) instead of useTranslations
('Settings.roles'). The root 'roles' namespace only exists in the
es-CO translation as a workaround added to mask this bug — in English
the chip rendered the raw keypath (e.g. 'roles.admin').

Aligns with invite-member-dialog.tsx:78 and members-tab.tsx:129,
which already use the 'Settings.roles' namespace.

Part of #375

src/components/settings/settings-overview.tsx

@@ -40,7 +40,7 @@ export function SettingsOverview({
     useAuth();
   const { mode, theme } = useTheme();
   const t = useTranslations('Settings.overview');
-  const tRoles = useTranslations('roles');
+  const tRoles = useTranslations('Settings.roles');
   const tSections = useTranslations('Settings.sections');
 
   const [counts, setCounts] = useState<OverviewCounts | null>(null);