Complete task from Calendar

[nimishavijay]

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

As discussed in #4085 currently you can see tasks on your calendar with a checkbox for indication that it is a task

However, to complete the task we have to navigate to the Tasks app and complete it there. This is not the most convenient solution as you would want to finish the task with just one click.

Describe the solution you'd like

It would be very convenient to mark this task as completed from the calendar itself.
On clicking on the checkbox the task could be marked as completed and on clicking on the task itself it open in the Tasks app.

Describe alternatives you've considered

No response

Additional context

No response

cc @raimund-schluessler @JuliaKirschenheuter @jancborchardt

[JuliaKirschenheuter]

Comment from @raimund-schluessler:
When we anyway do the rendering in Vue now, it should be possible to toggle the completed state when you click the checkbox and open the task in the Tasks app if you click somewhere else, no?

[joshtrichards]

Related: #4514