fix: update ORCID_REDIRECT_URI and enhance OAuth callback handling

- Changed ORCID_REDIRECT_URI in docker-compose for updated ngrok URL.
- Allowed all hosts in vite.config.js to support HTTPS tunnels during OAuth flows.
- Improved handling of OAuth codes in AuthCallbackPage to prevent duplicate exchanges.
- Added function to fetch ORCID display names to enrich researcher data in API service.

frontend/src/components/dashboard/ResearcherCard.jsx

@@ -8,15 +8,16 @@ import { formatDate, getInitials } from "../../utils/formatters";
  * Export buttons without coupling this component to API logic.
  */
 export function ResearcherCard({ researcher, actions = null }) {
+  const title = researcher.name || researcher.orcid_id || "Perfil ORCID";
   return (
     <section className="mb-5 flex flex-wrap items-start gap-5 rounded-2xl border border-surface-border/60 bg-surface-primary px-7 py-6">
       <div className="flex h-14 w-14 shrink-0 items-center justify-center rounded-full bg-brand-primary text-xl font-semibold text-white">
-        {getInitials(researcher.name)}
+        {getInitials(title)}
       </div>
 
       <div className="min-w-[200px] flex-1">
         <h2 className="mb-1 text-[22px] font-semibold text-ink-primary">
-          {researcher.name || "Investigador sin nombre"}
+          {title}
         </h2>
         <div className="flex flex-wrap items-center gap-2.5">
           <div className="inline-flex items-center gap-1.5">

frontend/src/pages/AuthCallbackPage.jsx

@@ -1,4 +1,4 @@
-import { useEffect, useState } from "react";
+import { useEffect, useRef, useState } from "react";
 import { useNavigate, useSearchParams } from "react-router-dom";
 
 import { Spinner } from "../components/ui/Spinner";
@@ -8,7 +8,7 @@ import { useAuth } from "../contexts/AuthContext";
 import { AUTH_MESSAGE_TYPE, AUTH_ERROR_TYPE } from "../contexts/AuthContext";
 
 /**
- * OAuth callback page — mounted at /auth/callback.
+ * OAuth callback page — mounted at /callback.
  *
  * ORCID redirects here after the user authenticates. We extract the
  * authorization `code`, exchange it for a JWT via the backend, store
@@ -16,8 +16,8 @@ import { AUTH_MESSAGE_TYPE, AUTH_ERROR_TYPE } from "../contexts/AuthContext";
  * close the window. Otherwise we navigate back to the landing page.
  *
  * For this page to be reached, the backend's ORCID_REDIRECT_URI env var
- * must be set to <frontend-origin>/auth/callback, e.g.:
- *   ORCID_REDIRECT_URI=http://localhost:5173/auth/callback
+ * must be set to <frontend-origin>/callback, e.g.:
+ *   ORCID_REDIRECT_URI=http://localhost:5173/callback
  */
 export function AuthCallbackPage() {
   const [searchParams] = useSearchParams();
@@ -26,8 +26,15 @@ export function AuthCallbackPage() {
 
   const [status, setStatus] = useState("loading"); // loading | success | error
   const [errorMsg, setErrorMsg] = useState("");
+  const hasHandledCodeRef = useRef(false);
 
   useEffect(() => {
+    // React StrictMode may remount components in development. OAuth codes
+    // are single-use, so a second exchange attempt triggers backend errors.
+    // This in-memory guard handles duplicate effect runs in same mount.
+    if (hasHandledCodeRef.current) return;
+    hasHandledCodeRef.current = true;
+
     const code = searchParams.get("code");
     const oauthError = searchParams.get("error");
     const errorDescription = searchParams.get("error_description");
@@ -53,6 +60,15 @@ export function AuthCallbackPage() {
       return;
     }
 
+    // Persistent dedupe across remounts/reloads in the popup.
+    const consumedKey = `orcid_oauth_code_consumed:${code}`;
+    if (sessionStorage.getItem(consumedKey) === "1") {
+      setStatus("success");
+      notifyAndClose({ type: AUTH_MESSAGE_TYPE });
+      return;
+    }
+    sessionStorage.setItem(consumedKey, "1");
+
     exchangeOrcidCode(code)
       .then(({ access_token }) => {
         storeToken(access_token);
@@ -60,6 +76,9 @@ export function AuthCallbackPage() {
         notifyAndClose({ type: AUTH_MESSAGE_TYPE, token: access_token });
       })
       .catch((err) => {
+        // Allow re-trying if the first attempt failed before code exchange
+        // actually happened on the backend (network cut, popup close, etc.).
+        sessionStorage.removeItem(consumedKey);
         const msg = err?.message ?? "No se pudo completar el inicio de sesión.";
         setStatus("error");
         setErrorMsg(msg);

frontend/src/services/api.js

@@ -39,6 +39,38 @@ const API_KEY = import.meta.env.VITE_API_KEY ?? "";
 
 const USE_MOCKS = import.meta.env.VITE_USE_MOCKS === "true";
 
+const ORCID_PUBLIC_BASE =
+  import.meta.env.VITE_ORCID_PUBLIC_API_BASE ?? "https://pub.sandbox.orcid.org/v3.0";
+
+const nameCache = new Map();
+
+function extractDisplayNameFromOrcidRecord(record) {
+  const given = record?.person?.name?.["given-names"]?.value;
+  const family = record?.person?.name?.["family-name"]?.value;
+  const full = [given, family].filter(Boolean).join(" ").trim();
+  return full || null;
+}
+
+async function fetchOrcidDisplayName(orcidId, { signal } = {}) {
+  if (!orcidId) return null;
+  if (nameCache.has(orcidId)) return nameCache.get(orcidId);
+
+  const url = `${ORCID_PUBLIC_BASE.replace(/\/$/, "")}/${encodeURIComponent(orcidId)}/record`;
+  try {
+    const res = await fetch(url, { signal, headers: { Accept: "application/json" } });
+    if (!res.ok) {
+      nameCache.set(orcidId, null);
+      return null;
+    }
+    const json = await res.json();
+    const name = extractDisplayNameFromOrcidRecord(json);
+    nameCache.set(orcidId, name);
+    return name;
+  } catch {
+    return null;
+  }
+}
+
 export class ApiError extends Error {
   constructor(message, { status, payload } = {}) {
     super(message);
@@ -98,6 +130,7 @@ async function request(path, { method = "GET", body, signal, headers } = {}) {
     } catch {
       /* sin cuerpo JSON */
     }
+
     const detail =
       payload?.detail ?? payload?.message ?? response.statusText ?? "Error";
     throw new ApiError(typeof detail === "string" ? detail : "Error de API", {
@@ -282,6 +315,18 @@ export async function searchResearchersBulk(orcidIds, { signal } = {}) {
     ? raw.results.map(normalizeResearcherBundle)
     : [];
 
+  // Frontend enrichment: backend may create researchers with `name=null`
+  // when discovered via search. We best-effort fill display name from
+  // ORCID Public API to keep UI consistent with OAuth login cases.
+  await Promise.all(
+    results.map(async (bundle) => {
+      const r = bundle?.researcher;
+      if (!r || r.name) return;
+      const name = await fetchOrcidDisplayName(r.orcid_id, { signal });
+      if (name) bundle.researcher = { ...r, name };
+    }),
+  );
+
   return {
     results,
     errors: Array.isArray(raw?.errors) ? raw.errors : [],

frontend/vite.config.js

@@ -11,6 +11,9 @@ export default defineConfig(({ mode }) => {
     plugins: [react(), tailwindcss()],
     server: {
       host: true,
+      // Needed for HTTPS tunnels like ngrok during OAuth callback flows.
+      // We allow all hosts in dev to avoid host-blocking when ngrok URL rotates.
+      allowedHosts: true,
       port: 5173,
       proxy: {
         // El backend agrupa todo bajo /api (researchers, export, …).