feat(webapp): chat paginate rooms

Created by: ulfgebhardt

Pullrequest

• pagination for rooms
• fetch more rooms
• some code cleanup & simplifications
• fetch only the single room when in single-room mode

Issues

• fixes #6546 (closed)

Todo

• None

Created by: Elweyn

Review: Approved

Merged by: ulfgebhardt at 2023-07-17 08:09:05 UTC