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/dashboard/RecentTasks.tsx

@@ -3,6 +3,7 @@
 import { Task } from '@/lib/types';
 import { Card } from '@/components/ui/Card';
 import { TagDisplay } from '@/components/ui/TagDisplay';
+import { formatDateShort } from '@/lib/date-utils';
 import { Badge } from '@/components/ui/Badge';
 import { useTasksContext } from '@/contexts/TasksContext';
 import { getPriorityConfig, getPriorityColorHex, getStatusBadgeClasses, getStatusLabel } from '@/lib/status-config';
@@ -18,7 +19,7 @@ export function RecentTasks({ tasks }: RecentTasksProps) {
   
   // Prendre les 5 tâches les plus récentes (créées ou modifiées)
   const recentTasks = tasks
-    .sort((a, b) => new Date(b.updatedAt).getTime() - new Date(a.updatedAt).getTime())
+    .sort((a, b) => b.updatedAt.getTime() - a.updatedAt.getTime())
     .slice(0, 5);
 
   // Fonctions simplifiées utilisant la configuration centralisée
@@ -116,10 +117,7 @@ export function RecentTasks({ tasks }: RecentTasksProps) {
                 </div>
                 
                 <div className="text-xs text-[var(--muted-foreground)] whitespace-nowrap">
-                  {new Date(task.updatedAt).toLocaleDateString('fr-FR', {
-                    day: 'numeric',
-                    month: 'short'
-                  })}
+                  {formatDateShort(task.updatedAt)}
                 </div>
               </div>
             </div>

src/components/dashboard/charts/CompletionRateChart.tsx

@@ -2,6 +2,7 @@
 
 import { LineChart, Line, XAxis, YAxis, CartesianGrid, Tooltip, ResponsiveContainer } from 'recharts';
 import { DailyMetrics } from '@/services/metrics';
+import { parseDate, formatDateShort } from '@/lib/date-utils';
 
 interface CompletionRateChartProps {
   data: DailyMetrics[];
@@ -12,7 +13,7 @@ export function CompletionRateChart({ data, className }: CompletionRateChartProp
   // Transformer les données pour le graphique
   const chartData = data.map(day => ({
     day: day.dayName.substring(0, 3), // Lun, Mar, etc.
-    date: new Date(day.date).toLocaleDateString('fr-FR', { day: '2-digit', month: '2-digit' }),
+    date: formatDateShort(parseDate(day.date)),
     completionRate: day.completionRate,
     completed: day.completed,
     total: day.totalTasks