Easily Selectable History (#1672)

This update replaces the previous ratatui history widget with an
append-only log so that the terminal can handle text selection and
scrolling. It also disables streaming responses, which we'll do our best
to bring back in a later PR. It also adds a small summary of token use
after the TUI exits.

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

@@ -50,10 +50,6 @@ impl<'a> BottomPaneView<'a> for ApprovalModalView<'a> {
         self.current.is_complete() && self.queue.is_empty()
     }
 
-    fn calculate_required_height(&self, area: &Rect) -> u16 {
-        self.current.get_height(area)
-    }
-
     fn render(&self, area: Rect, buf: &mut Buffer) {
         (&self.current).render_ref(area, buf);
     }