single click channel (#7596)

- Open channel notes and chat on channel click
- WIP
- Fix compile error
- Don't join live kit until requested
- Track in_call state separately from in_room



Release Notes:

- Improved channels: you can now be in a channel without joining the
audio call automatically

**or**

- N/A

---------

Co-authored-by: Nathan Sobo <nathan@zed.dev>

crates/collab/src/db/tables/room_participant.rs

@@ -20,6 +20,7 @@ pub struct Model {
     pub calling_connection_server_id: Option<ServerId>,
     pub participant_index: Option<i32>,
     pub role: Option<ChannelRole>,
+    pub in_call: bool,
 }
 
 impl Model {