Refine messages on waiting to join screen and include host avatar

crates/theme/src/theme.rs

@@ -48,6 +48,7 @@ pub struct Workspace {
     pub modal: ContainerStyle,
     pub notification: ContainerStyle,
     pub notifications: Notifications,
+    pub joining_project_avatar: ImageStyle,
     pub joining_project_message: ContainedText,
 }