Select existing Talk room for conversation, and streamline creation of new one

[ChristophWurst]

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

As a calendar app user I want to schedule meetings for existing Talk rooms, or create a new Talk room for my event.

Describe the solution you'd like

Design specs

• Secondary button "Talk room" or "Add Talk" to the right of "Location" field (or inside the field, on the right).
• Clicking opens a modal listing the existing Talk conversations, and a present "Create new Talk conversation" button on the top.
  • Picking any of the Talk conversation applies it
  • Clicking "Create new Talk conversation" automatically creates and adds the room to the event, with the event title and participants as usual
• @nimishavijay researching further how competition does it for adjustment
  • Google Calendar: Just has a section "Add Google Meet video conferencing" and it can only add a new room/link, not an existing one. Benefit: It’s just a single step
  • Teams: Single dropdown which allows you to select from a list of channels (seemingly no way to create a new channel?)

Screenshots for reference:

https://github.com/user-attachments/assets/2085ab1b-afc9-434e-84a8-7ad3fc612da2

Implementation

Talk has OCS APIs. Use that to fetch a list. Filter for conversations that are either openly joinable or where the actor is a moderator. This ensures that all recipients can be added to the conversation via the existing logic that happens on save.

Describe alternatives you've considered

N/a

Additional context

No response

[nimishavijay]

As a first version it could look like this:

Creating:

• "Add Talk" button next to location field
• Clicking on it opens a modal with the list of conversations

• Modal is the similar to the "Join open conversations" modal in Talk
• There is a "Create a new conversation" secondary button, clicking on which creates the Talk room with the same name as the event and closes the modal

• After adding the location field is filled with the URL as it is right now,
• nice-to-have: for those who can edit the event there is a "x" button to clear the field and show the "Add Talk" button again

Follow ups for this:

• Show the conversation name instead of the URL (in the small event modal as well)
• Have a tertiary close button which removes the Talk room and shows the empty location field with the "Add Talk" button again
• Have a copy icon which copies the URL to the clipboard