SettingsLayout rendered its own role-gated aside while the subscription page
rendered PurchaseSubscriptionSidebar, so /admin/subscription and other settings
pages (sms-wallet, ...) showed two different settings menus. Make SettingsLayout
render the shared PurchaseSubscriptionSidebar and have SubscriptionPage use
SettingsLayout too, so every settings page shows one identical menu. menuForRole
/ SETTINGS_MENU are kept for the mobile settings list (SettingsMenuPage).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
