FEATURE: Complete RoomCast implementation

[JoelWiebe]

Feature

Overview
Complete logic and UI improvements for RoomCasting

Tasks

• Store isActive status for each activity phase in the DB
• Fix display of play/stop button for each activity based on isActive value
• Create backend logic for fetching the current active phase
• Create basic RoomCasting environment UI
• Accurately push appropriate resources as tabs to the RoomCasting environment