Calendar: add day-total per day on the calendar-view

[petervanhee]

Is your feature request related to a problem? Please describe.
The calendar is very usefull for adding time entries but we lack the day-total per day. To verify that a day is complete (we have a standard workday of 8 hours/day), we have to switch to the personal timesheet where we have the day-total.

Describe the solution you'd like
Additional user-preference that activates the day-total in the Calendar-view

Describe alternatives you've considered
The alternative now is to use the Timesheet-view but this demands for an extra action for the user.

[kevinpapst]

See #2519

[github-actions]

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