feat(admin): add bottom navigation items and settings page to admin panel

src/features/admin/navigation.js

@@ -12,6 +12,7 @@ registerNavSection({ id: 'system',    title: 'Utilisateurs',    icon: 'UserMulti
 registerNavItem({ id: 'dashboard', label: 'Tableau de bord', icon: 'DashboardSquare03Icon', href: '/admin/dashboard', sectionId: 'dashboard', order: 10 });
 registerNavItem({ id: 'users',     label: 'Utilisateurs',   icon: 'UserMultiple02Icon',    href: '/admin/users',     sectionId: 'system',    order: 10 });
 registerNavItem({ id: 'roles',     label: 'Rôles',          icon: 'Crown03Icon',           href: '/admin/roles',     sectionId: 'system',    order: 20 });
+registerNavItem({ id: 'settings',  label: 'Paramètres',     icon: 'Settings02Icon',        href: '/admin/settings',  position: 'bottom',     order: 10 });
 
 /**
  * Build sections for AdminSidebar. Items are sérialisables (pas de composants),
@@ -19,7 +20,7 @@ registerNavItem({ id: 'roles',     label: 'Rôles',          icon: 'Crown03Icon'
  */
 export function buildNavigationSections(pathname) {
   const sections = getNavSections();
-  const items = getNavItems();
+  const items = getNavItems().filter(item => item.position !== 'bottom');
 
   const bySection = new Map();
   for (const item of items) {
@@ -37,3 +38,18 @@ export function buildNavigationSections(pathname) {
     .filter(s => bySection.has(s.id))
     .map(s => ({ id: s.id, title: s.title, icon: s.icon, items: bySection.get(s.id) }));
 }
+
+/**
+ * Build the list of bottom-pinned nav items for AdminSidebar.
+ */
+export function buildBottomNavItems(pathname) {
+  return getNavItems()
+    .filter(item => item.position === 'bottom')
+    .sort((a, b) => (a.order ?? 0) - (b.order ?? 0))
+    .map(item => ({
+      name: item.label,
+      href: item.href,
+      icon: item.icon,
+      current: pathname === item.href || pathname.startsWith(item.href + '/'),
+    }));
+}