refactor(guest): retire legacy guest app and move shared modules

resources/js/shared/guest/queue/notify.ts

@@ -0,0 +1,16 @@
+export function notify(text: string, type: 'success'|'error') {
+  // Lazy import to avoid cycle
+  import('../components/ToastHost')
+    .then(() => {
+      try {
+        // This only works inside React tree; for SW-triggered, we fallback
+        const evt = new CustomEvent('guest-toast', { detail: { text, type } });
+        window.dispatchEvent(evt);
+      } catch (error) {
+        console.warn('Dispatching toast event failed', error);
+      }
+    })
+    .catch((error) => {
+      console.warn('Toast module failed to load', error);
+    });
+}