feat(ocr): discard abandoned capture batches

A bad scan, the wrong PDFs or a duplicate upload used to leave a batch
sitting in READY_FOR_REVIEW forever, because the only exits were confirm
(posts to the books) or rejecting every page one at a time. Add a
DISCARDED terminal status to both OCR domains and a single endpoint per
domain that rejects every page still pending in one shot.

Discarding is refused once anything has landed: statements once a page is
POSTED, policies once a page is APPLIED. Those batches did real work and
have to be settled page by page.

- POST /statements/batches/:id/discard
- POST /policy-ocr/batches/:id/discard
- shared DiscardBatchCard on both review screens, gated the same way

apps/web/src/components/PolicyOcrReview.tsx

@@ -3,8 +3,10 @@
 import { useCallback, useEffect, useMemo, useState } from "react";
 import Link from "next/link";
 import { CustomerPicker } from "@/components/CustomerPicker";
+import { DiscardBatchCard } from "@/components/DiscardBatchCard";
 import {
   confirmPolicyOcrBatch,
+  discardPolicyOcrBatch,
   getPolicyOcrBatch,
   listCustomers,
   listPolicyOcrDocuments,
@@ -23,6 +25,8 @@ import type {
   PolicyOcrReviewInput,
 } from "@/lib/types";
 
+/** Document and batch statuses share this map — the two enums have no
+ *  overlapping members, and the header renders a batch status through it. */
 const STATUS_LABEL: Record<string, string> = {
   PENDING_OCR: "Pendiente",
   OCR_FAILED: "Falló OCR",
@@ -31,6 +35,12 @@ const STATUS_LABEL: Record<string, string> = {
   CONFIRMED: "Confirmado",
   POSTED: "Aplicado",
   REJECTED: "Rechazado",
+  UPLOADED: "Recibido",
+  PROCESSING: "Procesando…",
+  READY_FOR_REVIEW: "Listo para revisar",
+  COMPLETED: "Aplicado",
+  FAILED: "Falló",
+  DISCARDED: "Descartado",
 };
 
 const OPEN_FIRST = [
@@ -54,6 +64,7 @@ export function PolicyOcrReview({ id }: { id: string }) {
   const [error, setError] = useState<string | null>(null);
   const [loading, setLoading] = useState(true);
   const [submitting, setSubmitting] = useState(false);
+  const [discarding, setDiscarding] = useState(false);
 
   const load = useCallback(async () => {
     try {
@@ -129,9 +140,33 @@ export function PolicyOcrReview({ id }: { id: string }) {
     }
   }
 
+  async function onDiscard() {
+    if (!batch) return;
+    setDiscarding(true);
+    setError(null);
+    try {
+      await discardPolicyOcrBatch(batch.id);
+      setEdits({});
+      await load();
+    } catch (e) {
+      setError((e as Error)?.message ?? "No se pudo descartar el lote.");
+    } finally {
+      setDiscarding(false);
+    }
+  }
+
   if (loading) return <div className="state-box">Cargando…</div>;
   if (!batch) return <div className="state-box state-error">{error ?? "No encontrado."}</div>;
 
+  const appliedCount = docs.filter((d) => d.status === "POSTED").length;
+  // Discarding is only offered while the batch can still be abandoned whole:
+  // nothing applied yet, and not already discarded.
+  const canDiscard =
+    canReview &&
+    batch.status !== "DISCARDED" &&
+    batch.status !== "COMPLETED" &&
+    appliedCount === 0;
+
   return (
     <div className="stack">
       <header className="page-head">
@@ -175,6 +210,15 @@ export function PolicyOcrReview({ id }: { id: string }) {
         </section>
       )}
 
+      {canDiscard && (
+        <DiscardBatchCard
+          busy={discarding}
+          onDiscard={onDiscard}
+          pageCount={docs.length}
+          what="póliza"
+        />
+      )}
+
       <section className="stack">
         {sorted.map((doc) => (
           <DocumentRow