feat: timestamp component (§19), admin B2B page (§13)

## §19 Zona horaria
- New _components/timestamp.tsx: Intl.DateTimeFormat-based, auto-detects
  timezone from user role in localStorage
  · OPERADOR_BODEGA → America/New_York (EST/EDT)
  · All others → America/Guayaquil (ECT)
- Integrated in portal/mis-paquetes (list dates + status history)
- Integrated in portal/pago (paidAt timestamp)
- Integrated in admin/auditoria (replaces hardcoded toLocaleString)

## §13 B2B Admin page (/admin/b2b)
- Full admin UI for B2B import requests
- KPIs: total, pendientes, cotizados, aprobados, valor total cotizaciones
- Table with search + status filter
- Gestionar modal: change status, enter quotation amount + notes
- Uses api.b2b.list() + api.b2b.updateStatus()
- Added B2B link to admin sidebar nav

Build: clean (Next.js, no TS errors)

apps/web/src/app/_components/timestamp.tsx

@@ -0,0 +1,62 @@
+"use client";
+
+/**
+ * §19 Zona horaria — muestra fechas en la zona del usuario autenticado.
+ * OPERADOR_BODEGA y usuarios NJ → America/New_York (EST/EDT)
+ * Resto (clientes Ecuador, admins) → America/Guayaquil (ECT)
+ *
+ * Se determina por el rol guardado en localStorage ("user" JSON).
+ */
+
+import { useMemo } from "react";
+
+const NJ_ROLES = ["OPERADOR_BODEGA"];
+
+function getUserTimezone(): string {
+  try {
+    const raw = typeof window !== "undefined" ? localStorage.getItem("user") : null;
+    if (raw) {
+      const u = JSON.parse(raw) as { role?: string };
+      if (u.role && NJ_ROLES.includes(u.role)) return "America/New_York";
+    }
+  } catch {}
+  return "America/Guayaquil";
+}
+
+interface TimestampProps {
+  /** ISO 8601 date string or Date object */
+  value: string | Date | null | undefined;
+  /** Show date only (no time). Default false. */
+  dateOnly?: boolean;
+  /** Force a specific IANA timezone instead of auto-detecting. */
+  tz?: string;
+  /** Fallback text when value is null/undefined */
+  fallback?: string;
+}
+
+export function Timestamp({ value, dateOnly = false, tz, fallback = "—" }: TimestampProps) {
+  const formatted = useMemo(() => {
+    if (!value) return fallback;
+    const date = typeof value === "string" ? new Date(value) : value;
+    if (isNaN(date.getTime())) return fallback;
+
+    const timezone = tz ?? getUserTimezone();
+    const tzLabel = timezone === "America/New_York" ? "EST" : "ECT";
+
+    const opts: Intl.DateTimeFormatOptions = dateOnly
+      ? { year: "numeric", month: "short", day: "numeric", timeZone: timezone }
+      : {
+          year: "numeric",
+          month: "short",
+          day: "numeric",
+          hour: "2-digit",
+          minute: "2-digit",
+          timeZone: timezone,
+        };
+
+    const formatted = new Intl.DateTimeFormat("es-EC", opts).format(date);
+    return dateOnly ? formatted : `${formatted} (${tzLabel})`;
+  }, [value, dateOnly, tz, fallback]);
+
+  return <span title={value ? String(value) : undefined}>{formatted}</span>;
+}

apps/web/src/app/admin/auditoria/page.tsx

@@ -1,6 +1,7 @@
 "use client";
 import { useEffect, useState } from "react";
 import { api } from "@/lib/api";
+import { Timestamp } from "@/app/_components/timestamp";
 
 export default function AuditoriaPage() {
   const [logs, setLogs] = useState<any[]>([]);
@@ -41,7 +42,6 @@ export default function AuditoriaPage() {
     MFA_ENABLED: "badge-blue", MFA_FAILED: "badge-red", USER_REGISTER: "badge-green",
   };
 
-  const fmt = (d: string) => new Date(d).toLocaleString("es-EC", { timeZone: "America/Guayaquil" });
   const pages = Math.ceil(total / LIMIT);
 
   return (
@@ -101,7 +101,9 @@ export default function AuditoriaPage() {
                   <tr><td colSpan={6} style={{ textAlign: "center", padding: "2rem", color: "var(--gray-500)" }}>Sin registros.</td></tr>
                 ) : logs.map(l => (
                   <tr key={l.id}>
-                    <td style={{ fontSize: ".78rem", fontFamily: "monospace", whiteSpace: "nowrap" }}>{fmt(l.createdAt)}</td>
+                     <td style={{ fontSize: ".78rem", fontFamily: "monospace", whiteSpace: "nowrap" }}>
+                       <Timestamp value={l.createdAt} tz="America/Guayaquil" />
+                     </td>
                     <td><span className={`badge ${ACTION_COLORS[l.action] ?? "badge-gray"}`} style={{ fontSize: ".72rem" }}>{l.action}</span></td>
                     <td className="text-sm">{l.resource ?? "—"}</td>
                     <td className="text-sm" style={{ fontFamily: "monospace", fontSize: ".75rem", color: "var(--gray-500)" }}>{l.resourceId?.slice(0,12) ?? "—"}</td>

apps/web/src/app/admin/b2b/page.tsx

@@ -0,0 +1,331 @@
+"use client";
+import { useEffect, useState, useCallback } from "react";
+import { api } from "@/lib/api";
+import { Timestamp } from "@/app/_components/timestamp";
+
+// §13 — Flujo del Importador Mayorista (B2B)
+const STATUS_LABEL: Record<string, string> = {
+  PENDIENTE:   "Pendiente",
+  CONTACTADO:  "Contactado",
+  COTIZADO:    "Cotizado",
+  APROBADO:    "Aprobado",
+  EN_PROCESO:  "En proceso",
+  COMPLETADO:  "Completado",
+  CANCELADO:   "Cancelado",
+};
+
+const STATUS_BADGE: Record<string, string> = {
+  PENDIENTE:   "badge-yellow",
+  CONTACTADO:  "badge-blue",
+  COTIZADO:    "badge-blue",
+  APROBADO:    "badge-green",
+  EN_PROCESO:  "badge-orange",
+  COMPLETADO:  "badge-green",
+  CANCELADO:   "badge-red",
+};
+
+const STATUS_FLOW = ["PENDIENTE", "CONTACTADO", "COTIZADO", "APROBADO", "EN_PROCESO", "COMPLETADO", "CANCELADO"];
+
+export default function AdminB2BPage() {
+  const [requests, setRequests]   = useState<any[]>([]);
+  const [loading, setLoading]     = useState(true);
+  const [selected, setSelected]   = useState<any | null>(null);
+  const [updating, setUpdating]   = useState<string | null>(null);
+  const [filter, setFilter]       = useState("");
+  const [statusFilter, setStatusFilter] = useState("");
+
+  // Modal state
+  const [showModal, setShowModal]   = useState(false);
+  const [modalForm, setModalForm]   = useState({ status: "", quotationNotes: "", quotationAmount: "" });
+  const [saving, setSaving]         = useState(false);
+  const [msg, setMsg]               = useState<{ type: "success" | "error"; text: string } | null>(null);
+
+  const load = useCallback(() => {
+    setLoading(true);
+    api.b2b.list()
+      .then(setRequests)
+      .catch(() => {})
+      .finally(() => setLoading(false));
+  }, []);
+
+  useEffect(() => { load(); }, [load]);
+
+  const filtered = requests.filter(r => {
+    const matchSearch =
+      !filter ||
+      r.trackingId?.toLowerCase().includes(filter.toLowerCase()) ||
+      r.contactName?.toLowerCase().includes(filter.toLowerCase()) ||
+      r.companyName?.toLowerCase().includes(filter.toLowerCase()) ||
+      r.contactEmail?.toLowerCase().includes(filter.toLowerCase());
+    const matchStatus = !statusFilter || r.status === statusFilter;
+    return matchSearch && matchStatus;
+  });
+
+  // KPIs
+  const total     = requests.length;
+  const pendiente = requests.filter(r => r.status === "PENDIENTE").length;
+  const cotizado  = requests.filter(r => r.status === "COTIZADO").length;
+  const aprobado  = requests.filter(r => r.status === "APROBADO").length;
+  const totalValue = requests
+    .filter(r => r.quotationAmount)
+    .reduce((s, r) => s + Number(r.quotationAmount), 0);
+
+  const openModal = (r: any) => {
+    setSelected(r);
+    setModalForm({
+      status: r.status,
+      quotationNotes: r.quotationNotes ?? "",
+      quotationAmount: r.quotationAmount != null ? String(r.quotationAmount) : "",
+    });
+    setShowModal(true);
+    setMsg(null);
+  };
+
+  const handleSave = async () => {
+    if (!selected) return;
+    setSaving(true);
+    try {
+      await api.b2b.updateStatus(selected.id, {
+        status: modalForm.status,
+        quotationNotes: modalForm.quotationNotes || undefined,
+        quotationAmount: modalForm.quotationAmount ? Number(modalForm.quotationAmount) : undefined,
+      });
+      setMsg({ type: "success", text: "Solicitud actualizada." });
+      load();
+      setTimeout(() => { setShowModal(false); setMsg(null); }, 800);
+    } catch {
+      setMsg({ type: "error", text: "Error al actualizar. Intenta de nuevo." });
+    } finally {
+      setSaving(false);
+    }
+  };
+
+  const KPIS = [
+    { label: "Total solicitudes",  value: total,     color: "var(--primary)" },
+    { label: "Pendientes",         value: pendiente, color: "var(--warning)" },
+    { label: "Cotizados",          value: cotizado,  color: "var(--accent)" },
+    { label: "Aprobados",          value: aprobado,  color: "var(--green)" },
+    { label: "Valor cotizaciones", value: `$${totalValue.toLocaleString("es-EC", { minimumFractionDigits: 2 })}`, color: "var(--accent)" },
+  ];
+
+  return (
+    <div>
+      <div className="mb-6">
+        <h1 className="dash-page-title">Solicitudes B2B</h1>
+        <p className="dash-page-subtitle">Importadores mayoristas y empresas · §13</p>
+      </div>
+
+      {/* KPIs */}
+      <div style={{ display: "grid", gridTemplateColumns: "repeat(auto-fill, minmax(160px, 1fr))", gap: "1rem", marginBottom: "2rem" }}>
+        {KPIS.map(k => (
+          <div key={k.label} className="card" style={{ padding: "1.25rem" }}>
+            <div style={{ fontSize: ".78rem", color: "var(--gray-500)", marginBottom: ".5rem" }}>{k.label}</div>
+            <div style={{ fontSize: "1.5rem", fontWeight: 800, color: k.color }}>{k.value}</div>
+          </div>
+        ))}
+      </div>
+
+      {/* Filters */}
+      <div className="card" style={{ padding: "1rem", marginBottom: "1.5rem" }}>
+        <div style={{ display: "flex", gap: "1rem", flexWrap: "wrap" }}>
+          <input
+            className="form-input"
+            style={{ flex: 1, minWidth: 220 }}
+            placeholder="Buscar por ID, nombre, empresa o email..."
+            value={filter}
+            onChange={e => setFilter(e.target.value)}
+          />
+          <select
+            className="form-input"
+            style={{ minWidth: 180 }}
+            value={statusFilter}
+            onChange={e => setStatusFilter(e.target.value)}
+          >
+            <option value="">Todos los estados</option>
+            {STATUS_FLOW.map(s => (
+              <option key={s} value={s}>{STATUS_LABEL[s]}</option>
+            ))}
+          </select>
+          <button className="btn btn-ghost btn-sm" onClick={() => { setFilter(""); setStatusFilter(""); }}>
+            Limpiar
+          </button>
+        </div>
+      </div>
+
+      {/* Table */}
+      {loading ? (
+        <div style={{ display: "flex", justifyContent: "center", padding: "4rem" }}>
+          <div className="spinner" />
+        </div>
+      ) : filtered.length === 0 ? (
+        <div className="card" style={{ padding: "3rem", textAlign: "center" }}>
+          <div style={{ fontSize: "3rem", marginBottom: "1rem" }}>🏭</div>
+          <p style={{ color: "var(--gray-500)" }}>
+            {filter || statusFilter ? "Sin solicitudes que coincidan con los filtros." : "No hay solicitudes B2B registradas."}
+          </p>
+        </div>
+      ) : (
+        <div className="card">
+          <div style={{ overflowX: "auto" }}>
+            <table className="table">
+              <thead>
+                <tr>
+                  <th>ID</th>
+                  <th>Empresa / Contacto</th>
+                  <th>Mercancía</th>
+                  <th>Valor declarado</th>
+                  <th>Cotización</th>
+                  <th>Estado</th>
+                  <th>Fecha</th>
+                  <th>Acciones</th>
+                </tr>
+              </thead>
+              <tbody>
+                {filtered.map(r => (
+                  <tr key={r.id}>
+                    <td>
+                      <span style={{ fontFamily: "monospace", fontSize: ".8rem", fontWeight: 700, color: "var(--primary)" }}>
+                        {r.trackingId}
+                      </span>
+                    </td>
+                    <td>
+                      <div style={{ fontWeight: 600, fontSize: ".875rem" }}>
+                        {r.companyName || r.contactName}
+                      </div>
+                      <div style={{ fontSize: ".75rem", color: "var(--gray-500)" }}>{r.contactEmail}</div>
+                      {r.contactPhone && (
+                        <div style={{ fontSize: ".75rem", color: "var(--gray-400)" }}>{r.contactPhone}</div>
+                      )}
+                    </td>
+                    <td style={{ maxWidth: 200 }}>
+                      <div style={{ fontWeight: 600, fontSize: ".875rem" }}>{r.merchandiseType}</div>
+                      <div style={{ fontSize: ".75rem", color: "var(--gray-500)", overflow: "hidden", textOverflow: "ellipsis", whiteSpace: "nowrap" }}>
+                        {r.description}
+                      </div>
+                    </td>
+                    <td style={{ fontFamily: "monospace", fontSize: ".875rem" }}>
+                      {r.commercialValue != null ? `$${Number(r.commercialValue).toLocaleString("es-EC", { minimumFractionDigits: 2 })}` : "—"}
+                    </td>
+                    <td style={{ fontFamily: "monospace", fontSize: ".875rem" }}>
+                      {r.quotationAmount != null ? (
+                        <span style={{ color: "var(--green)", fontWeight: 700 }}>
+                          ${Number(r.quotationAmount).toLocaleString("es-EC", { minimumFractionDigits: 2 })}
+                        </span>
+                      ) : "—"}
+                    </td>
+                    <td>
+                      <span className={`badge ${STATUS_BADGE[r.status] ?? "badge-gray"}`}>
+                        {STATUS_LABEL[r.status] ?? r.status}
+                      </span>
+                    </td>
+                    <td style={{ fontSize: ".78rem", color: "var(--gray-500)", whiteSpace: "nowrap" }}>
+                      <Timestamp value={r.createdAt} dateOnly tz="America/Guayaquil" />
+                    </td>
+                    <td>
+                      <button
+                        className="btn btn-ghost btn-sm"
+                        style={{ fontSize: ".78rem" }}
+                        onClick={() => openModal(r)}
+                        disabled={updating === r.id}
+                      >
+                        Gestionar
+                      </button>
+                    </td>
+                  </tr>
+                ))}
+              </tbody>
+            </table>
+          </div>
+        </div>
+      )}
+
+      {/* Modal de gestión */}
+      {showModal && selected && (
+        <div style={{
+          position: "fixed", inset: 0, background: "rgba(0,0,0,.5)", display: "flex",
+          alignItems: "center", justifyContent: "center", zIndex: 1000, padding: "1rem",
+        }}>
+          <div className="card" style={{ width: "100%", maxWidth: 540, maxHeight: "90vh", overflowY: "auto" }}>
+            <div className="card-header" style={{ display: "flex", justifyContent: "space-between", alignItems: "center" }}>
+              <span style={{ fontWeight: 700 }}>Gestionar solicitud {selected.trackingId}</span>
+              <button className="btn btn-ghost btn-sm" onClick={() => setShowModal(false)}>✕</button>
+            </div>
+            <div className="card-body" style={{ display: "flex", flexDirection: "column", gap: "1.25rem" }}>
+
+              {/* Info del solicitante */}
+              <div style={{ background: "var(--gray-50)", borderRadius: "var(--radius)", padding: "1rem", fontSize: ".875rem" }}>
+                <div style={{ fontWeight: 600, marginBottom: ".5rem" }}>Solicitante</div>
+                <div><strong>Empresa:</strong> {selected.companyName || "—"}</div>
+                <div><strong>Contacto:</strong> {selected.contactName}</div>
+                <div><strong>Email:</strong> {selected.contactEmail}</div>
+                {selected.contactPhone && <div><strong>Teléfono:</strong> {selected.contactPhone}</div>}
+              </div>
+              <div style={{ background: "var(--gray-50)", borderRadius: "var(--radius)", padding: "1rem", fontSize: ".875rem" }}>
+                <div style={{ fontWeight: 600, marginBottom: ".5rem" }}>Mercancía</div>
+                <div><strong>Tipo:</strong> {selected.merchandiseType}</div>
+                <div style={{ marginTop: ".25rem" }}>{selected.description}</div>
+                {selected.commercialValue && (
+                  <div style={{ marginTop: ".25rem" }}><strong>Valor declarado:</strong> ${Number(selected.commercialValue).toFixed(2)}</div>
+                )}
+              </div>
+
+              {/* Cambio de estado */}
+              <div>
+                <label className="form-label">Estado</label>
+                <select
+                  className="form-input"
+                  value={modalForm.status}
+                  onChange={e => setModalForm(f => ({ ...f, status: e.target.value }))}
+                >
+                  {STATUS_FLOW.map(s => (
+                    <option key={s} value={s}>{STATUS_LABEL[s]}</option>
+                  ))}
+                </select>
+              </div>
+
+              {/* Monto de cotización */}
+              <div>
+                <label className="form-label">Monto cotizado (USD)</label>
+                <input
+                  type="number"
+                  min="0"
+                  step="0.01"
+                  className="form-input"
+                  placeholder="0.00"
+                  value={modalForm.quotationAmount}
+                  onChange={e => setModalForm(f => ({ ...f, quotationAmount: e.target.value }))}
+                />
+              </div>
+
+              {/* Notas */}
+              <div>
+                <label className="form-label">Notas de cotización</label>
+                <textarea
+                  className="form-input"
+                  rows={4}
+                  placeholder="Detalles del flete, condiciones, requisitos INEN, notas de aduana..."
+                  value={modalForm.quotationNotes}
+                  onChange={e => setModalForm(f => ({ ...f, quotationNotes: e.target.value }))}
+                  style={{ resize: "vertical", fontFamily: "inherit" }}
+                />
+              </div>
+
+              {msg && (
+                <div className={`alert alert-${msg.type === "success" ? "success" : "error"}`}>{msg.text}</div>
+              )}
+
+              <div style={{ display: "flex", gap: ".75rem", justifyContent: "flex-end" }}>
+                <button className="btn btn-ghost" onClick={() => setShowModal(false)} disabled={saving}>
+                  Cancelar
+                </button>
+                <button className="btn btn-primary" onClick={handleSave} disabled={saving}>
+                  {saving ? "Guardando..." : "Guardar cambios"}
+                </button>
+              </div>
+            </div>
+          </div>
+        </div>
+      )}
+    </div>
+  );
+}

apps/web/src/app/admin/layout.tsx

@@ -10,6 +10,7 @@ const NAV = [
   { href: "/admin/usuarios",           icon: "👥", label: "Usuarios" },
   { href: "/admin/tarifas",            icon: "💰", label: "Tarifas" },
   { href: "/admin/pagos",              icon: "💳", label: "Cobros" },
+  { href: "/admin/b2b",                icon: "🏭", label: "B2B" },
   { href: "/admin/notificaciones",     icon: "📋", label: "Notificaciones" },
   { href: "/admin/configuracion",      icon: "⚙️", label: "Configuración" },
   { href: "/admin/reportes",           icon: "📊", label: "Reportes" },

apps/web/src/app/portal/mis-paquetes/page.tsx

@@ -2,6 +2,7 @@
 import { useEffect, useState } from "react";
 import Link from "next/link";
 import { api } from "@/lib/api";
+import { Timestamp } from "@/app/_components/timestamp";
 
 // §08 — 11 estados oficiales
 const STATUS_LABEL: Record<string, string> = {
@@ -94,10 +95,10 @@ export default function MisPaquetesPage() {
                     {p.description ?? "Sin descripción"}
                     {p.vendorTracking ? ` · ${p.vendorTracking}` : ""}
                   </div>
-                  <div style={{ fontSize: ".8rem", color: "var(--gray-400)", marginTop: ".2rem" }}>
+                   <div style={{ fontSize: ".8rem", color: "var(--gray-400)", marginTop: ".2rem" }}>
-                    {new Date(p.createdAt).toLocaleDateString("es-EC")}
+                     <Timestamp value={p.createdAt} dateOnly />
-                    {p.actualWeight ? ` · ${p.actualWeight} lb` : p.declaredWeight ? ` · ~${p.declaredWeight} lb (declarado)` : ""}
+                     {p.actualWeight ? ` · ${p.actualWeight} lb` : p.declaredWeight ? ` · ~${p.declaredWeight} lb (declarado)` : ""}
-                  </div>
+                   </div>
                 </div>
                 <div style={{ display: "flex", flexDirection: "column", alignItems: "flex-end", gap: ".5rem" }}>
                   <span className={`badge ${STATUS_BADGE[p.status] ?? "badge-gray"}`}>
@@ -137,8 +138,8 @@ export default function MisPaquetesPage() {
                               <div style={{ fontSize: ".8rem", color: "var(--gray-500)" }}>{h.note}</div>
                             )}
                             <div style={{ fontSize: ".75rem", color: "var(--gray-400)", marginTop: ".2rem" }}>
-                              {new Date(h.createdAt).toLocaleString("es-EC")}
+                               <Timestamp value={h.createdAt} />
-                            </div>
+                             </div>
                           </div>
                         </div>
                       ))}

apps/web/src/app/portal/pago/page.tsx

@@ -2,6 +2,7 @@
 import { useEffect, useState, Suspense } from "react";
 import { useRouter, useSearchParams } from "next/navigation";
 import { api, getUser } from "@/lib/api";
+import { Timestamp } from "@/app/_components/timestamp";
 
 // §09 paso 8 — Página de pago del envío
 // URL: /portal/pago?packageId=xxx
@@ -105,10 +106,10 @@ function PagoContent() {
           }} />
           <span style={{ fontWeight: 600 }}>{STATUS_LABEL[payStatus]?.text ?? payStatus}</span>
           {payment.paidAt && (
-            <span style={{ marginLeft: "auto", fontSize: ".8rem", color: "var(--gray-500)" }}>
+              <span style={{ marginLeft: "auto", fontSize: ".8rem", color: "var(--gray-500)" }}>
-              {new Date(payment.paidAt).toLocaleString("es-EC")}
+                <Timestamp value={payment.paidAt} />
-            </span>
+              </span>
-          )}
+            )}
         </div>
       )}