fix(layout): show sys bar in iframe when show_menu=true for trusted users

The {#if} gate only allowed the sys bar to mount for admins or
trusted+edit_mode users in an iframe. Trusted staff using show_menu=true
had sys_menu.hide set correctly but the component never mounted. Add
!sys_menu.hide as an escape hatch so the URL override actually works.

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

src/routes/+layout.svelte

@@ -411,7 +411,7 @@ $effect(() => {
     </div>
 {/if}
 
-{#if browser && (!$ae_loc?.iframe || $ae_loc?.administrator_access || ($ae_loc?.trusted_access && $ae_loc.edit_mode))}
+{#if browser && (!$ae_loc?.iframe || !$ae_loc?.sys_menu?.hide || $ae_loc?.administrator_access || ($ae_loc?.trusted_access && $ae_loc.edit_mode))}
     <!-- print:hidden wrapper: sys/debug menus are fixed overlays — must not appear on printed pages -->
     <div class="print:hidden">
         <E_app_sys_bar