feat(ancpi): complete ePay UI + dedup protection

UI Components (Phase 4):
- epay-connect.tsx: connection widget with credit badge, auto-connect
- epay-order-button.tsx: per-parcel "Extras CF" button with status
- epay-tab.tsx: full "Extrase CF" tab with orders table, filters,
  download/refresh actions, new order form
- Minimal changes to parcel-sync-module.tsx: 5th tab + button on
  search results + ePay connect widget

Dedup Protection:
- epay-queue.ts: batch-level dedup (60s window, canonical key from
  sorted cadastral numbers)
- order/route.ts: request nonce idempotency (60s cache)
- test/route.ts: refresh protection (30s cache)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/modules/parcel-sync/components/epay-order-button.tsx

@@ -0,0 +1,153 @@
+"use client";
+
+import { useState, useEffect, useCallback, useRef } from "react";
+import { FileText, Loader2, Check } from "lucide-react";
+import { Button } from "@/shared/components/ui/button";
+import { cn } from "@/shared/lib/utils";
+import type { EpaySessionStatus } from "./epay-connect";
+
+/* ------------------------------------------------------------------ */
+/*  Props                                                              */
+/* ------------------------------------------------------------------ */
+
+type Props = {
+  nrCadastral: string;
+  siruta: string;
+  judetName: string;
+  uatName: string;
+};
+
+/* ------------------------------------------------------------------ */
+/*  Component                                                          */
+/* ------------------------------------------------------------------ */
+
+export function EpayOrderButton({
+  nrCadastral,
+  siruta,
+  judetName,
+  uatName,
+}: Props) {
+  const [ordering, setOrdering] = useState(false);
+  const [ordered, setOrdered] = useState(false);
+  const [error, setError] = useState("");
+  const [epayStatus, setEpayStatus] = useState<EpaySessionStatus>({
+    connected: false,
+  });
+  const mountedRef = useRef(true);
+
+  useEffect(() => {
+    return () => {
+      mountedRef.current = false;
+    };
+  }, []);
+
+  // Check ePay status and whether an extract exists
+  useEffect(() => {
+    let cancelled = false;
+
+    const check = async () => {
+      try {
+        // Check session
+        const sRes = await fetch("/api/ancpi/session");
+        const sData = (await sRes.json()) as EpaySessionStatus;
+        if (!cancelled) setEpayStatus(sData);
+
+        // Check if a completed extract already exists
+        const oRes = await fetch(
+          `/api/ancpi/orders?nrCadastral=${encodeURIComponent(nrCadastral)}&status=completed&limit=1`,
+        );
+        const oData = (await oRes.json()) as { orders?: unknown[]; total?: number };
+        if (!cancelled && oData.total && oData.total > 0) {
+          setOrdered(true);
+        }
+      } catch {
+        /* silent */
+      }
+    };
+    void check();
+
+    return () => {
+      cancelled = true;
+    };
+  }, [nrCadastral]);
+
+  const handleOrder = useCallback(async () => {
+    setOrdering(true);
+    setError("");
+    try {
+      const res = await fetch("/api/ancpi/order", {
+        method: "POST",
+        headers: { "Content-Type": "application/json" },
+        body: JSON.stringify({
+          parcels: [
+            {
+              nrCadastral,
+              siruta,
+              judetIndex: 0, // server resolves from SIRUTA
+              judetName,
+              uatId: 0, // server resolves from SIRUTA
+              uatName,
+            },
+          ],
+        }),
+      });
+      const data = (await res.json()) as { orders?: unknown[]; error?: string };
+      if (!res.ok || data.error) {
+        if (mountedRef.current) setError(data.error ?? "Eroare comandă");
+      } else {
+        if (mountedRef.current) setOrdered(true);
+      }
+    } catch {
+      if (mountedRef.current) setError("Eroare rețea");
+    } finally {
+      if (mountedRef.current) setOrdering(false);
+    }
+  }, [nrCadastral, siruta, judetName, uatName]);
+
+  const disabled =
+    !epayStatus.connected ||
+    (epayStatus.credits != null && epayStatus.credits < 1) ||
+    ordering;
+
+  if (ordered) {
+    return (
+      <Button
+        size="sm"
+        variant="ghost"
+        className="h-7 w-7 p-0 text-emerald-600 dark:text-emerald-400"
+        title="Extras CF comandat"
+        disabled
+      >
+        <Check className="h-3.5 w-3.5" />
+      </Button>
+    );
+  }
+
+  return (
+    <Button
+      size="sm"
+      variant="ghost"
+      className={cn(
+        "h-7 w-7 p-0",
+        error && "text-destructive",
+      )}
+      title={
+        error
+          ? error
+          : !epayStatus.connected
+            ? "ePay neconectat"
+            : epayStatus.credits != null && epayStatus.credits < 1
+              ? "Credite insuficiente"
+              : "Extras CF"
+      }
+      disabled={disabled}
+      onClick={() => void handleOrder()}
+    >
+      {ordering ? (
+        <Loader2 className="h-3.5 w-3.5 animate-spin" />
+      ) : (
+        <FileText className="h-3.5 w-3.5" />
+      )}
+    </Button>
+  );
+}