fix(tui): handle hidden app git directives (#21946)

codex-rs/tui/src/app/event_dispatch.rs

@@ -319,6 +319,14 @@ impl App {
             AppEvent::AppendMessageHistoryEntry { thread_id, text } => {
                 self.append_message_history_entry(thread_id, text);
             }
+            AppEvent::SyncThreadGitBranch { thread_id, branch } => {
+                if let Err(err) = app_server
+                    .thread_metadata_update_branch(thread_id, branch)
+                    .await
+                {
+                    tracing::warn!("failed to sync thread git branch from directive: {err}");
+                }
+            }
             AppEvent::LookupMessageHistoryEntry {
                 thread_id,
                 offset,