fix(frontend): resolve hydration mismatch and unauthorized api calls

frontend/src/components/job-card.tsx

@@ -24,6 +24,7 @@ import { useState, useEffect } from "react";
 import { useNotify } from "@/contexts/notification-context";
 import { useTranslation } from "@/lib/i18n";
 import { jobsApi } from "@/lib/api";
+import { useAuth } from "@/contexts/AuthContext";
 
 interface JobCardProps {
   job: Job;
@@ -33,12 +34,17 @@ interface JobCardProps {
 
 export function JobCard({ job, isApplied, applicationStatus }: JobCardProps) {
   const { t } = useTranslation();
+  const { user } = useAuth();
   const [isFavorited, setIsFavorited] = useState(false);
   const [isLoading, setIsLoading] = useState(true);
   const notify = useNotify();
 
   useEffect(() => {
     const checkFavorite = async () => {
+      if (!user) {
+        setIsLoading(false);
+        return;
+      }
       try {
         const res = await jobsApi.checkFavorite(job.id);
         setIsFavorited(res.isFavorite);
@@ -49,10 +55,14 @@ export function JobCard({ job, isApplied, applicationStatus }: JobCardProps) {
       }
     };
     checkFavorite();
-  }, [job.id]);
+  }, [job.id, user]);
 
   const handleFavorite = async () => {
     if (isLoading) return;
+    if (!user) {
+      notify.error("Erro", "Faça login para salvar vagas.");
+      return;
+    }
 
     try {
       if (isFavorited) {

frontend/src/lib/i18n.tsx

@@ -63,7 +63,22 @@ function resolveKey(dict: Record<string, unknown>, key: string): string | undefi
 }
 
 export function I18nProvider({ children }: { children: ReactNode }) {
-    const [locale, setLocaleState] = useState<Locale>(getInitialLocale);
+    const [locale, setLocaleState] = useState<Locale>('pt-BR');
+
+    useEffect(() => {
+        let initialLocale: Locale = 'pt-BR';
+        try {
+            const storedLocale = localStorage.getItem(localeStorageKey);
+            if (storedLocale && VALID_LOCALES.includes(storedLocale as Locale)) {
+                initialLocale = storedLocale as Locale;
+            } else if (navigator.language) {
+                initialLocale = normalizeLocale(navigator.language);
+            }
+        } catch {
+            // localStorage might be blocked
+        }
+        setLocaleState(initialLocale);
+    }, []);
 
     const setLocale = (newLocale: Locale) => {
         setLocaleState(newLocale);