fix(cmdk): Restrict shiftKey modifier to Enter key only

Shift+Tab is a standard reverse-tab navigation gesture, not an
"open in new tab" signal. Previously, both Enter and Tab forwarded
e.shiftKey to onActionSelection, so Shift+Tab incorrectly triggered
window.open instead of navigate in the modal handler.

Now shiftKey is only forwarded when the triggering key is Enter.

Co-Authored-By: Claude Sonnet 4 <noreply@anthropic.com>

Author: JonasBa

static/app/components/commandPalette/ui/commandPalette.tsx

@@ -356,8 +356,10 @@ export function CommandPalette(props: CommandPaletteProps) {
                       }
 
                       if (e.key === 'Enter' || e.key === 'Tab') {
+                        // Only forward shiftKey for Enter — Shift+Tab is reverse tab
+                        // navigation, not an "open in new tab" gesture.
                         onActionSelection(treeState.selectionManager.focusedKey, {
-                          modifierKeys: {shiftKey: e.shiftKey},
+                          modifierKeys: {shiftKey: e.key === 'Enter' && e.shiftKey},
                         });
                         return;
                       }