feat: migrate PDF417 barcode generation to zxing-wasm/writer

Replace custom PDF417 generation (generateBarcode/renderBarcode) with zxing-wasm's writeBarcode for improved reliability and smaller codebase. Updated all 4 components (BillEditForm, PrintPreview, ViewBillCard, ViewLocationCard) to use new Pdf417BarcodeWasm component with ecLevel 5 for error correction.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

app/ui/Pdf417BarcodeWasm.tsx

@@ -0,0 +1,76 @@
+'use client';
+
+import { useState, useEffect, FC } from 'react';
+import { writeBarcode, prepareZXingModule, type WriterOptions } from 'zxing-wasm/writer';
+
+// Configure WASM file location for writer
+prepareZXingModule({
+    overrides: {
+        locateFile: (path, prefix) => {
+            if (path.endsWith('.wasm')) {
+                return window.location.origin + '/zxing_writer.wasm';
+            }
+            return prefix + path;
+        }
+    }
+});
+
+export const Pdf417BarcodeWasm: FC<{ hub3aText: string, className?: string }> = ({ hub3aText, className }) => {
+    const [barcodeDataUrl, setBarcodeDataUrl] = useState<string | undefined>(undefined);
+    const [error, setError] = useState<string | undefined>(undefined);
+
+    useEffect(() => {
+        const generateBarcode = async () => {
+            try {
+                setError(undefined);
+                setBarcodeDataUrl(undefined);
+
+                const writerOptions: WriterOptions = {
+                    format: 'PDF417',
+                    ecLevel: "5",
+                    scale: 2,
+                };
+
+                const result = await writeBarcode(hub3aText, writerOptions);
+
+                // Convert PNG blob to data URL
+                const reader = new FileReader();
+                reader.onloadend = () => {
+                    setBarcodeDataUrl(reader.result as string);
+                };
+                reader.readAsDataURL(result.image as Blob);
+
+            } catch (err) {
+                console.error('Failed to generate PDF417 barcode:', err);
+                setError('Failed to generate barcode');
+            }
+        };
+
+        if (hub3aText) {
+            generateBarcode();
+        }
+    }, [hub3aText]);
+
+    // Show error state
+    if (error) {
+        return (
+            <div style={{ width: "350px", height: "92px" }} className="flex items-center justify-center">
+                <span className="text-error text-sm">{error}</span>
+            </div>
+        );
+    }
+
+    // Don't render until barcode is generated (prevents hydration mismatch)
+    if (!barcodeDataUrl) {
+        return (
+            <div style={{ width: "350px", height: "92px" }} className="flex items-center justify-center">
+                <span className="loading loading-spinner loading-lg"></span>
+            </div>
+        );
+    }
+
+    return (
+        // eslint-disable-next-line @next/next/no-img-element
+        <img src={barcodeDataUrl} alt="PDF417 Barcode" className={className} />
+    );
+}