refactor: enhance date handling across components

- Replaced direct date manipulations with utility functions for consistency and readability.
- Updated date formatting in `DailyCalendar`, `RecentTasks`, `CompletionRateChart`, and other components to use `formatDateShort` and `formatDateForDisplay`.
- Improved date parsing in `JiraLogs`, `JiraSchedulerConfig`, and `BackupSettingsPageClient` to ensure proper handling of date strings.
- Streamlined date initialization in `useDaily` and `DailyService` to utilize `getToday` and `getYesterday` for better clarity.

src/components/settings/AdvancedSettingsPageClient.tsx

@@ -8,6 +8,7 @@ import { Button } from '@/components/ui/Button';
 import { UserPreferencesProvider } from '@/contexts/UserPreferencesContext';
 import { backupClient, BackupListResponse } from '@/clients/backup-client';
 import Link from 'next/link';
+import { parseDate, getToday, formatDateForDisplay } from '@/lib/date-utils';
 
 interface DatabaseStats {
   taskCount: number;
@@ -86,22 +87,14 @@ export function AdvancedSettingsPageClient({
 
   const formatTimeAgo = (date: Date): string => {
     // Format fixe pour éviter les erreurs d'hydratation
-    const d = new Date(date);
-    return d.toLocaleDateString('fr-FR', {
-      day: '2-digit',
-      month: '2-digit',
-      year: 'numeric',
-      hour: '2-digit',
-      minute: '2-digit',
-      hour12: false
-    });
+    return formatDateForDisplay(date, 'DISPLAY_MEDIUM');
   };
 
   const getNextBackupTime = (): string => {
     if (!backupData.scheduler.nextBackup) return 'Non planifiée';
     
-    const nextBackup = new Date(backupData.scheduler.nextBackup);
-    const now = new Date();
+    const nextBackup = parseDate(backupData.scheduler.nextBackup);
+    const now = getToday();
     const diffMs = nextBackup.getTime() - now.getTime();
     const diffMins = Math.floor(diffMs / (1000 * 60));
     const diffHours = Math.floor(diffMins / 60);