no message

src/app/(main)/testing/page.tsx

@@ -11,6 +11,7 @@ import { FileDownload, Print, SettingsEthernet, Lan, Router } from "@mui/icons-m
 import dayjs from "dayjs";
 import { NEXT_PUBLIC_API_URL } from "@/config/api";
 import { clientAuthFetch } from "@/app/utils/clientAuthFetch";
+import * as XLSX from "xlsx";
 
 // Simple TabPanel component for conditional rendering
 interface TabPanelProps {
@@ -87,6 +88,9 @@ export default function TestingPage() {
     },
   ]);
 
+  // --- 6. GRN Preview (M18) ---
+  const [grnPreviewReceiptDate, setGrnPreviewReceiptDate] = useState("2026-03-16");
+
   // Generic handler for inline table edits
   const handleItemChange = (setter: any, id: number, field: string, value: string) => {
     setter((prev: any[]) => prev.map(item => 
@@ -207,6 +211,42 @@ export default function TestingPage() {
     }
   };
 
+  // GRN Preview CSV Download (Section 6)
+  const handleDownloadGrnPreviewXlsx = async () => {
+    try {
+      const response = await clientAuthFetch(
+        `${NEXT_PUBLIC_API_URL}/report/grn-preview-m18?receiptDate=${encodeURIComponent(grnPreviewReceiptDate)}`,
+        { method: "GET" },
+      );
+      if (response.status === 401 || response.status === 403) return;
+      if (!response.ok) throw new Error(`Download failed: ${response.status}`);
+
+      const data = await response.json();
+      const rows = Array.isArray(data?.rows) ? data.rows : [];
+
+      const ws = XLSX.utils.json_to_sheet(rows);
+      const wb = XLSX.utils.book_new();
+      XLSX.utils.book_append_sheet(wb, ws, "GRN Preview");
+
+      const xlsxArrayBuffer = XLSX.write(wb, { bookType: "xlsx", type: "array" });
+      const blob = new Blob([xlsxArrayBuffer], {
+        type: "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
+      });
+
+      const url = window.URL.createObjectURL(blob);
+      const link = document.createElement("a");
+      link.href = url;
+      link.setAttribute("download", `grn-preview-m18-${grnPreviewReceiptDate}.xlsx`);
+      document.body.appendChild(link);
+      link.click();
+      link.remove();
+      window.URL.revokeObjectURL(url);
+    } catch (e) {
+      console.error("GRN Preview XLSX Download Error:", e);
+      alert("GRN Preview XLSX download failed. Check console/network.");
+    }
+  };
+
   // Layout Helper
   const Section = ({ title, children }: { title: string, children?: React.ReactNode }) => (
     <Paper sx={{ p: 3, minHeight: '450px', display: 'flex', flexDirection: 'column' }}>
@@ -227,6 +267,7 @@ export default function TestingPage() {
         <Tab label="3. OnPack" />
         <Tab label="4. Laser" />
         <Tab label="5. HANS600S-M" />
+        <Tab label="6. GRN Preview" />
       </Tabs>
 
       <TabPanel value={tabValue} index={0}>
@@ -455,6 +496,33 @@ export default function TestingPage() {
         </Section>
       </TabPanel>
 
+      <TabPanel value={tabValue} index={5}>
+        <Section title="6. GRN Preview (M18)">
+          <Stack direction="row" spacing={2} sx={{ mb: 2, alignItems: "center" }}>
+            <TextField
+              size="small"
+              label="Receipt Date"
+              type="date"
+              value={grnPreviewReceiptDate}
+              onChange={(e) => setGrnPreviewReceiptDate(e.target.value)}
+              InputLabelProps={{ shrink: true }}
+            />
+            <Button
+              variant="contained"
+              color="success"
+              size="medium"
+              startIcon={<FileDownload />}
+              onClick={handleDownloadGrnPreviewXlsx}
+            >
+              Download GRN Preview XLSX
+            </Button>
+          </Stack>
+          <Typography variant="body2" color="textSecondary">
+            Backend endpoint: <code>/report/grn-preview-m18?receiptDate=YYYY-MM-DD</code>
+          </Typography>
+        </Section>
+      </TabPanel>
+
       {/* Dialog for OnPack */}
       <Dialog open={isPrinterModalOpen} onClose={() => setIsPrinterModalOpen(false)} fullWidth maxWidth="sm">
         <DialogTitle sx={{ bgcolor: 'success.main', color: 'white' }}>OnPack Printer Job Details</DialogTitle>

src/app/error.tsx

@@ -0,0 +1,31 @@
+"use client";
+
+import { useEffect } from "react";
+import { useRouter } from "next/navigation";
+
+/**
+ * When a server-side exception occurs (e.g. backend down during deploy),
+ * redirect to login instead of showing the default error page.
+ */
+export default function Error({
+  error,
+  reset,
+}: {
+  error: Error & { digest?: string };
+  reset: () => void;
+}) {
+  const router = useRouter();
+
+  useEffect(() => {
+    // Redirect to login so user can re-authenticate after backend restart
+    router.replace("/login");
+  }, [router]);
+
+  return (
+    <div className="flex min-h-[200px] flex-col items-center justify-center gap-2 p-4 text-center">
+      <p className="text-sm text-slate-600 dark:text-slate-400">
+        連線異常，正在導向登入頁…
+      </p>
+    </div>
+  );
+}

src/app/global-error.tsx

@@ -0,0 +1,41 @@
+"use client";
+
+import { useEffect } from "react";
+
+/**
+ * Catches root-level errors (e.g. backend down during deploy).
+ * Redirects to login instead of showing the default "Application error" page.
+ * Must define <html> and <body> because this replaces the root layout.
+ */
+export default function GlobalError({
+  error,
+  reset,
+}: {
+  error: Error & { digest?: string };
+  reset: () => void;
+}) {
+  useEffect(() => {
+    window.location.href = "/login";
+  }, []);
+
+  return (
+    <html lang="zh-TW">
+      <body>
+        <div
+          style={{
+            display: "flex",
+            minHeight: "100vh",
+            alignItems: "center",
+            justifyContent: "center",
+            fontFamily: "system-ui, sans-serif",
+            padding: "1rem",
+          }}
+        >
+          <p style={{ color: "#64748b", fontSize: "0.875rem" }}>
+            連線異常，正在導向登入頁…
+          </p>
+        </div>
+      </body>
+    </html>
+  );
+}