Cmd+D often fails to open the React Native Dev Menu bottom sheet (#58946)

Summary:
Pull Request resolved: #58946

`RCTKeyCommands` ignored all registered key commands whenever any window had an active first responder (e.g. a focused `TextInput`), so Cmd+D intermittently failed to open the Dev Menu in the iOS Simulator / Mac Catalyst.

Only unmodified key commands are now suppressed while a responder is active, so plain typing is still not intercepted while modifier shortcuts (Cmd+D, Cmd+R) fire reliably.

Changelog:
[iOS][Fixed] - Fix Cmd+D and other modifier key commands failing to open the Dev Menu when a view is the first responder

Differential Revision: D114042042

Author: vzaidman

packages/react-native/React/Base/RCTKeyCommands.m

@@ -137,8 +137,13 @@ - (void)handleKeyUIEventSwizzle:(UIEvent *)event
       }
     }
 
-    // Ignore key commands (except escape) when there's an active responder
-    if (!firstResponder) {
+    // When there's an active responder, ignore key commands that don't use a
+    // shortcut modifier (Command/Control/Option) so that typing into a focused
+    // view (e.g. a text field) isn't intercepted. Shift and Caps Lock don't
+    // count here since they're part of normal text input. Commands with a
+    // shortcut modifier (e.g. Cmd+D to open the Dev Menu) should still fire.
+    UIKeyModifierFlags shortcutModifiers = UIKeyModifierCommand | UIKeyModifierControl | UIKeyModifierAlternate;
+    if (!firstResponder || (modifierFlags & shortcutModifiers) != 0) {
       [self RCT_handleKeyCommand:modifiedInput flags:modifierFlags];
     }
   }