follow-up(LeftSidebar) - caching, broadcast optimizations #10283
Description
Follow-ups:
- Don't cache conversations when nothing actually changed (we know it from the patching action)
- Add methods to post specific messages into the broadcast channel into the talkBroadcastChannel service as well as methods to add message handlers
- Think about centralized way to control what and when is synced, when to post messages
Originally posted by @ShGKme in #10203 (comment)