chore: bump gpui-pre to 0.3.8 and clean up unused code

crates/chat_ui/Cargo.toml

@@ -18,7 +18,6 @@ nostr-sdk.workspace = true
 anyhow.workspace = true
 itertools.workspace = true
 smallvec.workspace = true
-log.workspace = true
 serde.workspace = true
 
 regex = "1"

crates/chat_ui/src/lib.rs

@@ -243,8 +243,6 @@ impl ChatPanel {
                         }
                     }
                     RoomEvent::Reload => {
-                        // Defer to avoid re-entrant read on Room while
-                        // emit_refresh holds a write lock (via refresh_rooms).
                         cx.defer_in(window, |this, window, cx| {
                             this.get_messages(window, cx);
                         });