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/hooks/useDaily.ts

@@ -43,7 +43,7 @@ interface UseDailyActions {
  * Hook pour la gestion d'une vue daily spécifique
  */
 export function useDaily(initialDate?: Date, initialDailyView?: DailyView): UseDailyState & UseDailyActions & { currentDate: Date } {
-  const [currentDate, setCurrentDate] = useState<Date>(initialDate || new Date());
+  const [currentDate, setCurrentDate] = useState<Date>(initialDate || getToday());
   const [dailyView, setDailyView] = useState<DailyView | null>(initialDailyView || null);
   const [loading, setLoading] = useState(!initialDailyView); // Pas de loading si on a des données SSR
   const [refreshing, setRefreshing] = useState(false); // Pour les refresh silencieux