fix(cmdk): Restore new-tab behavior for admin links

The /_admin/ actions were converted to 'to' props, causing
isExternalLocation to return false (same origin) and navigate()
to attempt client-side routing to Django-served admin pages.

Switch both admin CMDKActions to onAction with window.open so
they open in a new tab as originally intended.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: JonasBa

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

@@ -227,15 +227,21 @@ export function GlobalCommandPaletteActions() {
           <CMDKAction
             display={{label: t('Open _admin'), icon: <IconOpen />}}
             keywords={[t('superuser')]}
-            to="/_admin/"
+            onAction={() => window.open('/_admin/', '_blank', 'noreferrer')}
           />
           <CMDKAction
             display={{
               label: t('Open %s in _admin', organization.name),
               icon: <IconOpen />,
             }}
             keywords={[t('superuser')]}
-            to={`/_admin/customers/${organization.slug}/`}
+            onAction={() =>
+              window.open(
+                `/_admin/customers/${organization.slug}/`,
+                '_blank',
+                'noreferrer'
+              )
+            }
           />
           {!isActiveSuperuser() && (
             <CMDKAction