refactor: enhance ProtectedRoute and dashboard components for improved access control and user experience

- Updated the ProtectedRoute component to optimize access checking logic, preventing unnecessary re-checks and improving authentication flow.
- Enhanced the dashboard page to automatically open the login modal for authentication errors and refined loading states for better user feedback.
- Improved UI elements across various components for consistency and visual appeal, including updated tab styles and enhanced alert messages.
- Removed redundant footer from the vacation management page to streamline the interface.

apps/web/src/routes/(dashboard)/+page.svelte

@@ -9,12 +9,13 @@
   import { UserPlus, Mail } from "lucide-svelte";
   import { useAuth } from "@mmailaender/convex-better-auth-svelte/svelte";
   import ProtectedRoute from "$lib/components/ProtectedRoute.svelte";
+  import { loginModalStore } from "$lib/stores/loginModal.svelte";
 
   let { data } = $props();
 
   const auth = useAuth();
-  const isLoading = $derived(auth.isLoading && !data.currentUser);
-  const isAuthenticated = $derived(auth.isAuthenticated || !!data.currentUser);
+  const isLoading = $derived(auth.isLoading && !data?.currentUser);
+  const isAuthenticated = $derived(auth.isAuthenticated || !!data?.currentUser);
 
   $inspect({ isLoading, isAuthenticated });
 
@@ -56,6 +57,11 @@
         redirectRoute = route;
         showAlert = true;
 
+        // Se for erro de autenticação, abrir modal de login automaticamente
+        if (error === "auth_required") {
+          loginModalStore.open(route || to.url.pathname);
+        }
+
         // Limpar URL usando SvelteKit (após router estar inicializado)
         try {
           replaceState(to.url.pathname, {});
@@ -75,6 +81,17 @@
   onMount(() => {
     mounted = true;
 
+    // Verificar se há erro na URL ao carregar a página
+    const urlParams = new URLSearchParams(window.location.search);
+    if (urlParams.has("error")) {
+      const error = urlParams.get("error");
+      const route = urlParams.get("route") || urlParams.get("redirect") || "";
+      
+      if (error === "auth_required") {
+        loginModalStore.open(route || window.location.pathname);
+      }
+    }
+
     // Atualizar relógio e forçar refresh das queries a cada segundo
     const interval = setInterval(() => {
       currentTime = new Date();