2.0.26: Add shared admin flash→toast bridge partial
Re-emit session flash (error/warning/success/info) as a `notify` event so controller-plain admin screens surface feedback via <x-gp247::toast>, not only Livewire callers. Included once in the admin and plain layouts. Modification 20260821T172947 (US-SADM-order-create-stock-feedback, ADR admin-shell_flash-toast-bridge). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>