feat: integrate Jira configuration into Header and layout

- Added `JiraConfigProvider` to `layout.tsx` for server-side Jira configuration retrieval.
- Updated `Header.tsx` to conditionally display a link to the Jira dashboard with the project key if Jira is configured.
- Enhanced user experience by integrating Jira settings into the main application layout.

components/ui/Header.tsx

@@ -1,6 +1,7 @@
 import { Card, CardContent } from '@/components/ui/Card';
 import { TaskStats } from '@/lib/types';
 import { useTheme } from '@/contexts/ThemeContext';
+import { useJiraConfig } from '@/contexts/JiraConfigContext';
 import { usePathname } from 'next/navigation';
 import Link from 'next/link';
 
@@ -13,6 +14,7 @@ interface HeaderProps {
 
 export function Header({ title = "TowerControl", subtitle = "Task Management", stats, syncing = false }: HeaderProps) {
   const { theme, toggleTheme } = useTheme();
+  const { isConfigured: isJiraConfigured, config: jiraConfig } = useJiraConfig();
   const pathname = usePathname();
 
   // Fonction pour déterminer si un lien est actif
@@ -82,6 +84,14 @@ export function Header({ title = "TowerControl", subtitle = "Task Management", s
               >
                 Tags
               </Link>
+              {isJiraConfigured && (
+                <Link
+                  href="/jira-dashboard"
+                  className={getLinkClasses('/jira-dashboard')}
+                >
+                  Jira ({jiraConfig?.projectKey})
+                </Link>
+              )}
               <Link
                 href="/settings"
                 className={getLinkClasses('/settings')}