fix(i18n): honor general_time_format across all time displays

Route 10 surfaces that hardcoded 12-hour date-fns patterns
('h:mm a', 'PPp', 'p', toLocaleTimeString) through useLocalizedDate's
formatDateTime/formatTime so they respect general_date_format +
general_time_format: backup/restore, archives, photo viewer, feedback,
event details, gallery timeline, public quote page, CMS save indicator.
Also pin a lang hint on the business-hours native time inputs (Chrome/Edge
render 24h). Drops now-unused date-fns imports.

frontend/src/pages/admin/ArchivesPage.tsx

@@ -19,10 +19,12 @@ import { Button, Input, Card, Loading } from '../../components/common';
 import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
 import { archiveService } from '../../services/archive.service';
 import { useTranslation } from 'react-i18next';
+import { useLocalizedDate } from '../../hooks/useLocalizedDate';
 // import { useNavigate } from 'react-router-dom';
 
 export const ArchivesPage: React.FC = () => {
   const { t } = useTranslation();
+  const { formatTime: fmtTime } = useLocalizedDate();
   const [searchTerm, setSearchTerm] = useState('');
   const [filterType, setFilterType] = useState<string>('all');
   const [sortBy, setSortBy] = useState<'date' | 'size' | 'name'>('date');
@@ -286,7 +288,7 @@ export const ArchivesPage: React.FC = () => {
                       <div>
                         <p>{formatDate(archive.archivedAt, 'MMM d, yyyy') || t('archives.processing')}</p>
                         <p className="text-xs text-neutral-500 dark:text-neutral-400">
-                          {formatDate(archive.archivedAt, 'h:mm a')}
+                          {archive.archivedAt ? fmtTime(archive.archivedAt) : ''}
                         </p>
                       </div>
                     </td>

frontend/src/pages/admin/BackupManagement.tsx

@@ -15,10 +15,10 @@ import {
 } from 'lucide-react';
 import { toast } from 'react-toastify';
 import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
-import { format } from 'date-fns';
 import { useTranslation } from 'react-i18next';
 
 import { Button, Card, Loading } from '../../components/common';
+import { useLocalizedDate } from '../../hooks/useLocalizedDate';
 import { BackupDashboard } from '../../components/admin/BackupDashboard';
 import { BackupConfiguration } from '../../components/admin/BackupConfiguration';
 import { BackupHistory } from '../../components/admin/BackupHistory';
@@ -33,6 +33,7 @@ export const BackupManagement: React.FC = () => {
   const [activeTab, setActiveTab] = useState<TabId>('dashboard');
   const queryClient = useQueryClient();
   const { t } = useTranslation();
+  const { formatDateTime: fmtDateTime } = useLocalizedDate();
 
   const tabs = [
     { id: 'dashboard' as const, label: t('backup.tabs.dashboard'), icon: HardDrive },
@@ -122,7 +123,7 @@ export const BackupManagement: React.FC = () => {
                 <>
                   <CheckCircle className="h-5 w-5 text-green-500" />
                   <span className="text-neutral-700 dark:text-neutral-300">
-                    {t('backup.status.lastBackup')}: {format(new Date(backupStatus.lastBackup.created_at), 'PPp')}
+                    {t('backup.status.lastBackup')}: {fmtDateTime(backupStatus.lastBackup.created_at)}
                   </span>
                 </>
               ) : (

frontend/src/pages/admin/CMSPage.tsx

@@ -16,7 +16,7 @@ import { useLocalizedDate } from '../../hooks/useLocalizedDate';
 
 export const CMSPage: React.FC = () => {
   const { t } = useTranslation();
-  const { formatDateTime: fmtDateTime } = useLocalizedDate();
+  const { formatDateTime: fmtDateTime, formatTime: fmtTime } = useLocalizedDate();
   const queryClient = useQueryClient();
   const [selectedPage, setSelectedPage] = useState<string>('impressum');
   const [editingLang, setEditingLang] = useState<'en' | 'de'>('en');
@@ -592,7 +592,7 @@ export const CMSPage: React.FC = () => {
                 {!hasUnsavedChanges && lastSaved && (
                   <div className="flex items-center gap-2 text-green-600">
                     <Clock className="w-4 h-4" />
-                    Saved {new Date(lastSaved).toLocaleTimeString()}
+                    Saved {fmtTime(new Date(lastSaved))}
                   </div>
                 )}
               </div>

frontend/src/pages/admin/EventDetailsPage.tsx

@@ -244,7 +244,7 @@ export const EventDetailsPage: React.FC = () => {
   const navigate = useNavigate();
   const queryClient = useQueryClient();
   const { t } = useTranslation();
-  const { format } = useLocalizedDate();
+  const { format, formatDateTime: fmtDateTime } = useLocalizedDate();
   const { flags } = useFeatureFlags();
 
   // Validate ID parameter
@@ -2330,7 +2330,7 @@ export const EventDetailsPage: React.FC = () => {
                 <div>
                   <p className="text-sm font-medium text-neutral-500 dark:text-neutral-400">{t('events.archivedOn')}</p>
                   <p className="text-sm text-neutral-900 dark:text-neutral-100">
-                    {event.archived_at && format(safeParseDate(event.archived_at)!, 'PPp')}
+                    {event.archived_at && fmtDateTime(safeParseDate(event.archived_at)!)}
                   </p>
                 </div>
                 

frontend/src/pages/admin/EventFeedbackPage.tsx

@@ -25,13 +25,15 @@ import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
 import { eventsService } from '../../services/events.service';
 import { feedbackService } from '../../services/feedback.service';
 import type { PhotoFeedback, FeedbackAnalytics, FeedbackResponse } from '../../services/feedback.service';
+import { useLocalizedDate } from '../../hooks/useLocalizedDate';
 
 export const EventFeedbackPage: React.FC = () => {
   const { id } = useParams<{ id: string }>();
   const navigate = useNavigate();
   const queryClient = useQueryClient();
   const { t } = useTranslation();
-  
+  const { formatDateTime: fmtDateTime } = useLocalizedDate();
+
   const [activeTab, setActiveTab] = useState<'settings' | 'feedback' | 'analytics' | 'moderation'>('settings');
   const [feedbackFilter, setFeedbackFilter] = useState({
     type: '',
@@ -297,7 +299,7 @@ export const EventFeedbackPage: React.FC = () => {
                               const d = typeof item.created_at === 'string' 
                                 ? parseISO(item.created_at) 
                                 : new Date(item.created_at);
-                              return isNaN(d.getTime()) ? t('common.unknownDate', 'Unknown date') : format(d, 'PPpp');
+                              return isNaN(d.getTime()) ? t('common.unknownDate', 'Unknown date') : fmtDateTime(d);
                             })()}
                           </p>
                         </div>

frontend/src/pages/public/QuoteResponsePage.tsx

@@ -31,7 +31,7 @@ import { formatShortDate } from '../../utils/dateShort';
 
 export const QuoteResponsePage: React.FC = () => {
   const { t, i18n } = useTranslation();
-  const { formatDateTime: fmtDateTime } = useLocalizedDate();
+  const { formatDateTime: fmtDateTime, formatTime: fmtTime } = useLocalizedDate();
   const { token } = useParams<{ token: string }>();
   const [searchParams, setSearchParams] = useSearchParams();
   const [error, setError] = useState<string | null>(null);
@@ -309,7 +309,7 @@ export const QuoteResponsePage: React.FC = () => {
                           ? Math.max(0, Math.ceil((lockAt.getTime() - Date.now()) / 60000))
                           : 0;
                         return {
-                          at: lockAt ? lockAt.toLocaleTimeString() : '',
+                          at: lockAt ? fmtTime(lockAt) : '',
                           minutes,
                         };
                       })())