approval ui (#1933)

Asking for approval:

<img width="269" height="41" alt="image"
src="https://github.com/user-attachments/assets/b9ced569-3297-4dae-9ce7-0b015c9e14ea"
/>

Allow:

<img width="400" height="31" alt="image"
src="https://github.com/user-attachments/assets/92056b22-efda-4d49-854d-e2943d5fcf17"
/>

Reject:

<img width="372" height="30" alt="image"
src="https://github.com/user-attachments/assets/be9530a9-7d41-4800-bb42-abb9a24fc3ea"
/>

Always Approve:

<img width="410" height="36" alt="image"
src="https://github.com/user-attachments/assets/acf871ba-4c26-4501-b303-7956d0151754"
/>

codex-rs/tui/src/chatwidget.rs

@@ -45,7 +45,6 @@ use crate::bottom_pane::BottomPane;
 use crate::bottom_pane::BottomPaneParams;
 use crate::bottom_pane::CancellationEvent;
 use crate::bottom_pane::InputResult;
-use crate::exec_command::strip_bash_lc_and_escape;
 use crate::history_cell::CommandOutput;
 use crate::history_cell::HistoryCell;
 use crate::history_cell::PatchEventType;
@@ -393,17 +392,6 @@ impl ChatWidget<'_> {
                 reason,
             }) => {
                 self.finalize_active_stream();
-                // Log a background summary immediately so the history is chronological.
-                let cmdline = strip_bash_lc_and_escape(&command);
-                let text = format!(
-                    "command requires approval:\n$ {cmdline}{reason}",
-                    reason = reason
-                        .as_ref()
-                        .map(|r| format!("\n{r}"))
-                        .unwrap_or_default()
-                );
-                self.add_to_history(HistoryCell::new_background_event(text));
-
                 let request = ApprovalRequest::Exec {
                     id,
                     command,