Features:
- Add "Change Status" option to TaskMenu dropdown
- Allows changing task status (backlog/in progress/blocked/done) from tree view
- Shows current status with checkmark
- No longer need to switch to Kanban view to change status
- Implement recursive time aggregation for subtasks
- Tasks now show total time including all descendant subtasks
- Display format varies based on estimates:
- "1.5h" - only task's own estimate
- "(2h from subtasks)" - only subtask estimates
- "1h (3h total)" - both own and subtask estimates
- Works in both TreeView (hierarchical) and KanbanView (flat list)
- New utility functions: calculateTotalTime, calculateTotalTimeFlat, formatTimeWithTotal
This allows better project planning by showing total time investment for tasks with subtasks.
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