refactor(task-list): update subtask and indicator visibility logic

- Modified subtask visibility conditions across TaskCard, EnhancedKanbanTaskCard, KanbanTaskCard, and TaskRow components to only display when the count is greater than 1.
- Enhanced task indicators for comments and attachments to follow the same visibility logic.
- Added new dependencies for task management types to support subscriber and attachment features.

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

@@ -191,29 +191,31 @@ const EnhancedKanbanTaskCard: React.FC<EnhancedKanbanTaskCardProps> = React.memo
             <Flex gap={4} align="center">
               <CustomDueDatePicker task={task} onDateChange={setDueDate} />
 
-              {/* Subtask Section */}
-              <Button
-                onClick={handleSubtaskButtonClick}
-                size="small"
-                style={{
-                  padding: 0,
-                }}
-                type="text"
-              >
-                <Tag
-                  bordered={false}
+              {/* Subtask Section - only show if count > 1 */}
+              {task.sub_tasks_count != null && Number(task.sub_tasks_count) > 1 && (
+                <Button
+                  onClick={handleSubtaskButtonClick}
+                  size="small"
                   style={{
-                    display: 'flex',
-                    alignItems: 'center',
-                    margin: 0,
-                    backgroundColor: themeWiseColor('white', '#1e1e1e', themeMode),
+                    padding: 0,
                   }}
+                  type="text"
                 >
-                  <ForkOutlined rotate={90} />
-                  <span>{task.sub_tasks_count}</span>
-                  {task.show_sub_tasks ? <CaretDownFilled /> : <CaretRightFilled />}
-                </Tag>
-              </Button>
+                  <Tag
+                    bordered={false}
+                    style={{
+                      display: 'flex',
+                      alignItems: 'center',
+                      margin: 0,
+                      backgroundColor: themeWiseColor('white', '#1e1e1e', themeMode),
+                    }}
+                  >
+                    <ForkOutlined rotate={90} />
+                    <span>{task.sub_tasks_count || 0}</span>
+                    {task.show_sub_tasks ? <CaretDownFilled /> : <CaretRightFilled />}
+                  </Tag>
+                </Button>
+              )}
             </Flex>
           </Flex>
           <Flex vertical gap={8}>