Show tasks without start/end date base on due date

Is your feature request related to a problem? Please describe.

I use tasks in nextcloud, but never set a start or end date. For me a task is just something that has to be done at or before a certain time (due date). I create them on my phone or in nextcloud quickly in between of things so I don't forget something. So setting a due date but also a start date (that is equal to the due date) is quite cumbersome. Creating tasks right in the calendar app would be the best workflow for me, but I believe that's different issue already.

So the implementation I was thinking is roughly like this:

• Add a setting 'Show tasks with only due date'
• if the start_date and end_date are both empty/null, show the task based on the due date, otherwise use the start/end date. (Or don't show it if it has neither of the three)

Describe the solution you'd like

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Describe alternatives you've considered

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Additional context

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No files, tests, or entry points are named. Start by locating the task display logic and the settings entry point, then trace how start and end dates determine visibility. Done means an opt-in setting makes tasks with only a due date appear according to that date while tasks with no relevant dates remain hidden.