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/kanban/TaskCard.tsx

@@ -427,7 +427,7 @@ export function TaskCard({ task, onEdit, compactView = false }: TaskCardProps) {
             {task.dueDate ? (
               <span className="flex items-center gap-1 text-[var(--muted-foreground)] font-mono">
                 <span className="text-[var(--primary)]">⏰</span>
-                {formatDistanceToNow(new Date(task.dueDate), { 
+                {formatDistanceToNow(task.dueDate, { 
                   addSuffix: true, 
                   locale: fr 
                 })}