refactor(task-list): enhance styling and structure in TaskListV2 and TaskRow components

- Consolidated import statements for better readability.
- Improved layout and styling consistency by adding border styles to various elements in TaskRow and AddTaskRow components.
- Updated TaskListV2Table to enhance the rendering logic and maintainability.
- Adjusted custom column handling and task estimation display for improved user experience.

worklenz-frontend/src/features/task-management/task-management.slice.ts

@@ -281,8 +281,8 @@ export const fetchTasksV3 = createAsyncThunk(
           dueDate: task.dueDate,
           startDate: task.startDate,
           timeTracking: {
-            estimated: convertTimeValue(task.total_time),
-            logged: convertTimeValue(task.time_spent),
+            estimated: task.timeTracking?.estimated || 0,
+            logged: task.timeTracking?.logged || 0,
           },
           customFields: {},
           custom_column_values: task.custom_column_values || {},