tui: show queued messages during response stream (#5540)

This fixes an issue where messages sent during the final response stream
would seem to disappear, because the "queued messages" UI wasn't shown
during streaming.

codex-rs/tui/src/history_cell.rs

@@ -127,11 +127,7 @@ impl HistoryCell for UserHistoryCell {
         let style = user_message_style();
 
         let wrapped = word_wrap_lines(
-            &self
-                .message
-                .lines()
-                .map(|l| Line::from(l).style(style))
-                .collect::<Vec<_>>(),
+            self.message.lines().map(|l| Line::from(l).style(style)),
             // Wrap algorithm matches textarea.rs.
             RtOptions::new(usize::from(wrap_width))
                 .wrap_algorithm(textwrap::WrapAlgorithm::FirstFit),