feat: optimize active filters display in KanbanFilters

- Replaced `hasActiveFilters` with `activeFiltersCount` for clearer filter count logic.
- Updated UI to show the count of active filters instead of a boolean check, enhancing user feedback on active filters.

components/kanban/KanbanFilters.tsx

@@ -79,6 +79,7 @@ export function KanbanFilters({ filters, onFiltersChange }: KanbanFiltersProps)
   };
 
   const hasActiveFilters = filters.search || filters.tags?.length || filters.priorities?.length;
+  const activeFiltersCount = (filters.tags?.length || 0) + (filters.priorities?.length || 0) + (filters.search ? 1 : 0);
 
   const priorityOptions: { value: TaskPriority; label: string; color: string }[] = [
     { value: 'urgent', label: 'Urgent', color: 'bg-red-500' },
@@ -160,14 +161,14 @@ export function KanbanFilters({ filters, onFiltersChange }: KanbanFiltersProps)
               <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M19 9l-7 7-7-7" />
             </svg>
             Filtres
-            {hasActiveFilters && (
+            {activeFiltersCount > 0 && (
               <span className="bg-cyan-500 text-slate-900 text-xs px-2 py-0.5 rounded-full font-medium">
-                {(filters.tags?.length || 0) + (filters.priorities?.length || 0) + (filters.search ? 1 : 0)}
+                {activeFiltersCount}
               </span>
             )}
           </Button>
 
-          {hasActiveFilters && (
+          {activeFiltersCount > 0 && (
             <Button
               variant="ghost"
               onClick={handleClearFilters}
@@ -233,7 +234,7 @@ export function KanbanFilters({ filters, onFiltersChange }: KanbanFiltersProps)
             )}
 
             {/* Résumé des filtres actifs */}
-            {hasActiveFilters && (
+            {activeFiltersCount > 0 && (
               <div className="bg-slate-800/30 rounded-lg p-3 border border-slate-700/50">
                 <div className="text-xs text-slate-400 font-mono uppercase tracking-wider mb-2">
                   Filtres actifs