点击任务除了完成、删除，还可以取消任务(不删除任务但是把任务结束) More options for task ending

[yoghurtdewdew]

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What Happened?

在 agenda 的任务页面，看到可以删除任务delete，可以完成任务complete键DONE，但任务的处理状态可以有更多，除了重新安排时间，还可以通过取消任务来结束任务，希望能多一个放弃任务canceled键CANCELED，这里需要注意和弹窗中原有的取消cancle键区分。

On the task page of agenda, it can be seen that we can delete the task via delete button, and we can complete the task via complete button DONE. But the processing status of the task could be more. In addition to rescheduling, we can also end the task by canceling the task. I hope that there will be a canceled button to cancel tasks. CANCELED needs to be distinguished from the original cancle button in the pop-up window.

Reproduce the Bug

在任务弹窗里（未完成的任务） In the task pop-up window (in-complete tasks)

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Environment Information

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Additional Context

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Are you willing to submit a PR? If you know how to fix the bug.

• [ ] I'm willing to submit a PR (Thank you!)