Preserve modified Ctrl+C keys in active TUI views (#58990)

## Why

The keypress inspector could not display `ctrl-alt-c` or `ctrl-shift-c` because these keys bypassed the active view as if they were plain `Ctrl+C`.

## What changed

Require the modifier set to be exactly Control for the `Ctrl+C` exception when routing keys to active views. Keys with additional modifiers now reach the active view.

## Testing

Add regression coverage verifying that the inspector displays `ctrl-alt-c` and `ctrl-shift-c`, while plain `Ctrl+C` still closes it for either uppercase or lowercase `C`.

GitOrigin-RevId: cdad4dc73c096e6f07d1a951123db981c4837eac

codex-rs/tui/src/app/input_ownership_tests.rs

@@ -54,3 +54,30 @@ async fn selection_copy_cancels_a_pending_find_editor_chord() -> Result<()> {
     tui.set_owned_screen(/*owned*/ false)?;
     Ok(())
 }
+
+#[tokio::test]
+async fn keypress_inspector_distinguishes_ctrl_alt_c_from_ctrl_c() -> Result<()> {
+    let mut app = crate::app::test_support::make_test_app().await;
+    let mut tui = crate::tui::test_support::make_test_tui()?;
+    for (modifier, expected, cancel) in [
+        (KeyModifiers::ALT, "ctrl-alt-c", 'c'),
+        (KeyModifiers::SHIFT, "ctrl-shift-c", 'C'),
+    ] {
+        app.chat_widget.open_keymap_debug(&app.keymap);
+        let inspect = KeyEvent::new(KeyCode::Char('c'), KeyModifiers::CONTROL | modifier);
+        let inspect = app
+            .route_key_chord_event(&mut tui, inspect)
+            .expect("physical inspector key");
+        app.chat_widget.handle_key_event(inspect);
+        let screen =
+            crate::chatwidget::tests::render_bottom_popup(&app.chat_widget, /*width*/ 80);
+        assert!(
+            screen.contains(&format!("Config key: {expected}")),
+            "{screen}"
+        );
+        app.chat_widget
+            .handle_key_event(KeyEvent::new(KeyCode::Char(cancel), KeyModifiers::CONTROL));
+        assert!(!app.chat_widget.has_active_view());
+    }
+    Ok(())
+}

codex-rs/tui/src/chatwidget/interaction.rs

@@ -114,7 +114,7 @@ impl ChatWidget {
                     modifiers,
                     kind: KeyEventKind::Press,
                     ..
-                } if modifiers.contains(KeyModifiers::CONTROL) && c.eq_ignore_ascii_case(&'c')
+                } if modifiers == KeyModifiers::CONTROL && c.eq_ignore_ascii_case(&'c')
             )
             && (self.bottom_pane.warnings_active()
                 || (!key_hint::ctrl(KeyCode::Char('r')).is_press(key_event)