Recurring sheduled messages

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Feature request

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

Sometimes there are recurring topics in a chat room. In my concrete example I want to make sure that every four weeks there is a certain topic on the agenda of a call.

Describe the solution you'd like

When scheduling a chat message it would be nice if I could define something like "repeats every 4 weekly". Repeating options should be probably the same like for calendar events to cover most users use case.

Describe alternatives you've considered

In my concrete example this could be also part of the agenda-bot. Obsidian for example allows you to define such rules directly in markdown: https://publish.obsidian.md/tasks/Getting+Started/Recurring+Tasks
Not sure how easy this would be for not so technical users, but it would be a way to integrate it into the agenda chat message.

Another option would be to run a script outside of Nextcloud to post regularly a chat message. But this requires a lot of work and coding skills.

I think a option when scheduling a message would be the most elegant and user friendly way.

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

The issue does not name files, tests, or an entry point. Start by locating the existing scheduled chat-message flow and reviewing how recurrence rules are represented for calendar events; clarify the supported schedules and user interface before implementation. Done means users can create and manage recurring scheduled chat messages with the agreed recurrence options.