chore: add project files and setup gitignore

reserva-mesa-dashboard/components/dashboard/NotificationMonitor.tsx

@@ -0,0 +1,55 @@
+"use client";
+
+import { useEffect, useRef } from "react";
+import { ref, onChildAdded, off, get } from "firebase/database";
+import { db } from "@/lib/firebase";
+import { useAuth } from "@/hooks/useAuth";
+import { useToast } from "@/components/ui/toast";
+
+export function NotificationMonitor() {
+  const { user } = useAuth();
+  const { toast } = useToast();
+  const isInitialLoad = useRef(true);
+  const seenReservas = useRef<Set<string>>(new Set());
+
+  useEffect(() => {
+    if (!user?.email) return;
+
+    const reservasRef = ref(db, "reservas");
+
+    // Primeiro, marcamos todas as reservas existentes como "vistas"
+    // para não disparar notificações para o passado
+    const loadExisting = async () => {
+      const snapshot = await get(reservasRef);
+      if (snapshot.exists()) {
+        const data = snapshot.val();
+        Object.keys(data).forEach(id => seenReservas.current.add(id));
+      }
+      isInitialLoad.current = false;
+    };
+
+    loadExisting();
+
+    const unsubscribe = onChildAdded(reservasRef, (snapshot) => {
+      const id = snapshot.key;
+      if (!id || seenReservas.current.has(id)) return;
+      
+      // Adiciona ao set para não repetir se o listener reiniciar
+      seenReservas.current.add(id);
+
+      // Se ainda estivermos no load inicial (do get), ignoramos o toast
+      if (isInitialLoad.current) return;
+
+      const data = snapshot.val();
+      if (data.restauranteEmail === user.email && data.estado === "Pendente") {
+        toast(`Nova reserva recebida de ${data.clienteEmail}!`, "info");
+      }
+    });
+
+    return () => {
+      off(reservasRef, "child_added", unsubscribe);
+    };
+  }, [user?.email, toast]);
+
+  return null; // Componente apenas lógico
+}