Re-add Agenda items if they are unchecked

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Feature request

Which Nextcloud Version are you currently using: 31.0.7

Is your feature request related to a problem? Please describe.
At the moment whenever you a call start the agenda is generated. But after closing the call the agenda gets cleared and is empty. This makes it hard to use the agenda in rooms where calls with different usergroups could happen or if some taks are not covered.

Describe the solution you'd like
I would like that all unchecked agenda points automaiclally stay on the agenda until checked.

Describe alternatives you've considered
The alternative atm is to manually add all open points again after a call which is also a bit hard because you can't easly copy it from the call summary.

Additional context
Add any other context or screenshots about the feature request here.

Start by tracing how the agenda is generated when a call starts and cleared when it ends. Identify where agenda items and their checked state are stored, then verify that unchecked points remain available for later calls while completed points do not; add or update tests for this behavior if the project has coverage for agenda handling.