Allow to disable 'all-day' setting and edit time of recurring appointment

Is your feature request related to a problem? Please describe.
I don't know what happened, but creating a recurring appointment (in the web interface) for my French class I couldn't deselect 'All day' - assuming it's possible to create a recurring appointment for a specific timeslot I guess my browser was a bit slow. I saved it as I didn't want to recreate the recurrence. Now I can't seem to edit the series as a whole to adjust the time slots.

Describe the solution you'd like
Introduce possibility to edit 'all-day settings of a [whole] recurrence-set', by allowing me to edit the event I'm seeing and applying the change to the whole series (e.g. by adding a button "Update whole occurrence set").

Describe alternatives you've considered
Introducing a button like 'edit whole recurrence set' in the edit pop-up in the calendar view, which would then open the full event view/edit interface on the right-hand side, but then for the whole occurrence set.

Additional context

No files, tests, or entry points are named in the issue. Start by tracing the web calendar's recurring-event edit flow and how all-day changes are applied to an occurrence or series. Done means a recurring appointment can switch all-day status and edit its time for the whole recurrence set.