feat(enhanced-kanban): enhance task card styling for improved UI

- Added a light border, box shadow, and background color to the EnhancedKanbanTaskCard for a more visually appealing design.
- Refactored the rendering of TaskCard components in KanbanGroup to eliminate unnecessary React.Fragment wrappers, improving code clarity.

worklenz-frontend/src/components/enhanced-kanban/EnhancedKanbanBoardNativeDnD/KanbanGroup.tsx

@@ -122,7 +122,6 @@ const KanbanGroup: React.FC<KanbanGroupProps> = memo(({
                 )}
 
                 {group.tasks.map((task, idx) => (
-                    <React.Fragment key={task.id}>
                     <TaskCard
                         task={task}
                         onTaskDragStart={onTaskDragStart}
@@ -132,7 +131,6 @@ const KanbanGroup: React.FC<KanbanGroupProps> = memo(({
                         isDropIndicator={hoveredGroupId === group.id && hoveredTaskIdx === idx}
                         idx={idx}
                     />
-                    </React.Fragment>
                 ))}
                 {(isOwnerOrAdmin || isProjectManager) && !showNewCardTop && !showNewCardBottom && group.tasks.length > 0 && (
                     <Button

worklenz-frontend/src/components/enhanced-kanban/EnhancedKanbanTaskCard.css

@@ -13,6 +13,12 @@
   position: relative;
 }
 
+html.light .enhanced-kanban-task-card {
+  border: 1.5px solid #e1e4e8 !important; /* Asana-like light border */
+  box-shadow: 0 1px 4px 0 rgba(60, 64, 67, 0.08), 0 0.5px 1.5px 0 rgba(60, 64, 67, 0.03);
+  background: #fff !important;
+}
+
 .enhanced-kanban-task-card:hover {
   box-shadow: 0 2px 6px var(--ant-color-shadow);
   transform: translateY(-1px);