bug: fix CLI UP/ENTER (#4944)

Clear the history cursor before checking for duplicate submissions so
sending the same message twice exits history mode. This prevents Up/Down
from staying stuck in history browsing after duplicate sends.

codex-rs/tui/src/bottom_pane/chat_composer_history.rs

@@ -59,14 +59,15 @@ impl ChatComposerHistory {
             return;
         }
 
+        self.history_cursor = None;
+        self.last_history_text = None;
+
         // Avoid inserting a duplicate if identical to the previous entry.
         if self.local_history.last().is_some_and(|prev| prev == text) {
             return;
         }
 
         self.local_history.push(text.to_string());
-        self.history_cursor = None;
-        self.last_history_text = None;
     }
 
     /// Should Up/Down key presses be interpreted as history navigation given