feat: Enable CTRL-n and CTRL-p for navigating slash commands, files, history (#1994)

Adds CTRL-n and CTRL-p navigation for slash commands, files, and
history.
Closes #1992

Co-authored-by: Eric Traut <etraut@openai.com>

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

@@ -410,6 +410,11 @@ impl ChatComposer {
         match key_event {
             KeyEvent {
                 code: KeyCode::Up, ..
+            }
+            | KeyEvent {
+                code: KeyCode::Char('p'),
+                modifiers: KeyModifiers::CONTROL,
+                ..
             } => {
                 popup.move_up();
                 (InputResult::None, true)
@@ -417,6 +422,11 @@ impl ChatComposer {
             KeyEvent {
                 code: KeyCode::Down,
                 ..
+            }
+            | KeyEvent {
+                code: KeyCode::Char('n'),
+                modifiers: KeyModifiers::CONTROL,
+                ..
             } => {
                 popup.move_down();
                 (InputResult::None, true)
@@ -584,6 +594,11 @@ impl ChatComposer {
         match key_event {
             KeyEvent {
                 code: KeyCode::Up, ..
+            }
+            | KeyEvent {
+                code: KeyCode::Char('p'),
+                modifiers: KeyModifiers::CONTROL,
+                ..
             } => {
                 popup.move_up();
                 (InputResult::None, true)
@@ -591,6 +606,11 @@ impl ChatComposer {
             KeyEvent {
                 code: KeyCode::Down,
                 ..
+            }
+            | KeyEvent {
+                code: KeyCode::Char('n'),
+                modifiers: KeyModifiers::CONTROL,
+                ..
             } => {
                 popup.move_down();
                 (InputResult::None, true)
@@ -870,6 +890,11 @@ impl ChatComposer {
             KeyEvent {
                 code: KeyCode::Up | KeyCode::Down,
                 ..
+            }
+            | KeyEvent {
+                code: KeyCode::Char('p') | KeyCode::Char('n'),
+                modifiers: KeyModifiers::CONTROL,
+                ..
             } => {
                 if self
                     .history
@@ -878,6 +903,8 @@ impl ChatComposer {
                     let replace_text = match key_event.code {
                         KeyCode::Up => self.history.navigate_up(&self.app_event_tx),
                         KeyCode::Down => self.history.navigate_down(&self.app_event_tx),
+                        KeyCode::Char('p') => self.history.navigate_up(&self.app_event_tx),
+                        KeyCode::Char('n') => self.history.navigate_down(&self.app_event_tx),
                         _ => unreachable!(),
                     };
                     if let Some(text) = replace_text {