revert: restore legacy PDF417 barcode generation implementation

Restore custom PDF417 generator, renderer, and component that were previously removed. Update all components to use the legacy Pdf417Barcode instead of Pdf417BarcodeWasm.

Restored files:
- app/lib/pdf/pdf417.ts - Custom PDF417 generator library
- app/lib/pdf/renderBarcode.ts - Canvas-based barcode renderer
- app/ui/Pdf417Barcode.tsx - React component using custom generator

Updated imports in:
- app/ui/BillEditForm.tsx
- app/ui/PrintPreview.tsx
- app/ui/ViewBillCard.tsx
- app/ui/ViewLocationCard.tsx

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

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

app/lib/pdf/renderBarcode.ts

@@ -0,0 +1,51 @@
+import { BarcodeArray } from './pdf417';
+
+/**
+ * Renders a PDF417 barcode matrix to a canvas and returns it as a data URL.
+ *
+ * This function creates an HTML canvas element, draws the barcode by iterating through
+ * the barcode matrix, and converts the canvas to a base64-encoded PNG data URL that
+ * can be used as an image source.
+ *
+ * @param barcodeMatrix - The barcode array generated by the PDF417 encoder containing
+ *                        the barcode matrix data with dimensions and binary code values
+ * @param blockWidth - The width in pixels of each individual barcode module (bar/space unit)
+ * @param blockHeight - The height in pixels of each individual barcode module (bar/space unit)
+ *
+ * @returns A data URL string (base64-encoded PNG) representing the rendered barcode image,
+ *          suitable for use in an HTML img src attribute
+ *
+ * @example
+ * ```typescript
+ * const pdf417 = createPDF417();
+ * pdf417.init("Hello World", 2, 2);
+ * const barcodeArray = pdf417.getBarcodeArray();
+ * const dataUrl = renderBarcode(barcodeArray, 2, 4);
+ * // dataUrl can now be used: <img src={dataUrl} />
+ * ```
+ */
+export function renderBarcode(barcodeMatrix: BarcodeArray, blockWidth: number, blockHeight: number) {
+  
+  const canvas = document.createElement('canvas');
+  canvas.width = barcodeMatrix.num_cols * blockWidth;
+  canvas.height = barcodeMatrix.num_rows * blockHeight;
+  const ctx = canvas.getContext('2d') as CanvasRenderingContext2D;
+
+  let positionY = 0;
+  for (let row = 0; row < barcodeMatrix.num_rows; row += 1) {
+    let positionX = 0;
+
+    for (let col = 0; col < barcodeMatrix.num_cols; col += 1) {
+      if (barcodeMatrix.bcode[row][col] === 1) {
+        ctx.fillStyle = '#000';
+      } else {
+        ctx.fillStyle = '#FFF';
+      }
+      ctx.fillRect(positionX, positionY, blockWidth, blockHeight);
+      positionX += blockWidth;
+    }
+    positionY += blockHeight;
+  }
+
+  return canvas.toDataURL();
+}

app/ui/BillEditForm.tsx

@@ -10,7 +10,7 @@ import { formatYearMonth } from "../lib/format";
 import { DecodeResult, findDecodePdf417 } from "../lib/pdf/barcodeDecoderWasm";
 import { useLocale, useTranslations } from "next-intl";
 import { InfoBox } from "./InfoBox";
-import { Pdf417BarcodeWasm } from "./Pdf417BarcodeWasm";
+import { Pdf417Barcode } from "./Pdf417Barcode";
 
 // Next.js does not encode an utf-8 file name correctly when sending a form with a file attachment
 // This is a workaround for that
@@ -203,7 +203,7 @@ export const BillEditForm: FC<BillEditFormProps> = ({ location, bill }) => {
                         hub3aText ?
                             <div className="form-control p-1">
                                 <label className="label p-2 grow bg-white border border-gray-300 rounded-box justify-center">
-                                    <Pdf417BarcodeWasm hub3aText={hub3aText} />
+                                    <Pdf417Barcode hub3aText={hub3aText} />
                                 </label>
                                 <p className="text-xs my-1">{t.rich('barcode-disclaimer', { br: () => <br /> })}</p>
                             </div> : null

app/ui/Pdf417Barcode.tsx

@@ -0,0 +1,33 @@
+'use client';
+
+import { useState, useEffect, FC } from 'react';
+import { generateBarcode } from '../lib/pdf/pdf417';
+import { renderBarcode } from '../lib/pdf/renderBarcode';
+    
+export const Pdf417Barcode:FC<{hub3aText:string, className?: string, errorCorrectionLevel?: number}> = ({  hub3aText: hub3a_text, className, errorCorrectionLevel = 3}) => {
+    const [bitmapData, setBitmapData] = useState<string | undefined>(undefined);
+
+    console.log("Rendering Pdf417Barcode with hub3a_text:", hub3a_text);
+
+    useEffect(() => {
+        const aspectRatio = 3;
+        
+        const barcodeMatrix = generateBarcode(hub3a_text, errorCorrectionLevel , aspectRatio);
+        const bitmap = renderBarcode(barcodeMatrix, 1, 1);
+        setBitmapData(bitmap);
+    }, [hub3a_text]);
+
+    // Don't render until bitmap is generated (prevents hydration mismatch)
+    if (!bitmapData) {
+        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={bitmapData} alt="PDF417 Barcode" className={className}  />
+    );
+}

app/ui/PrintPreview.tsx

@@ -1,7 +1,7 @@
 'use client';
 
 import { PrintBarcodeData } from '../lib/actions/printActions';
-import { Pdf417BarcodeWasm } from './Pdf417BarcodeWasm';
+import { Pdf417Barcode } from './Pdf417Barcode';
 
 export interface PrintPreviewProps {
   data: PrintBarcodeData[];
@@ -132,7 +132,7 @@ export const PrintPreview: React.FC<PrintPreviewProps> = ({ data, year, month, t
                 <td className="border-2 border-gray-800 px-3 py-1.5 text-center">
                   <div className="flex justify-center items-center">
                     {
-                      item.hub3aText ? <Pdf417BarcodeWasm hub3aText={item.hub3aText} className="print:m-[5em_auto]" /> : null
+                      item.hub3aText ? <Pdf417Barcode hub3aText={item.hub3aText} /> : null
                     }
                   </div>
                 </td>

app/ui/ViewBillCard.tsx

@@ -8,7 +8,7 @@ import { useRouter } from "next/navigation";
 import { formatYearMonth } from "../lib/format";
 import { useTranslations } from "next-intl";
 import { uploadProofOfPayment } from "../lib/actions/billActions";
-import { Pdf417BarcodeWasm } from "./Pdf417BarcodeWasm";
+import { Pdf417Barcode } from "./Pdf417Barcode";
 
 export interface ViewBillCardProps {
     location: BillingLocation;
@@ -111,7 +111,7 @@ export const ViewBillCard: FC<ViewBillCardProps> = ({ location, bill, shareId })
                     hub3aText ?
                         <div className="form-control p-1">
                             <label className="label p-2 grow bg-white border border-gray-300 rounded-box justify-center">
-                                <Pdf417BarcodeWasm hub3aText={hub3aText} />
+                                <Pdf417Barcode hub3aText={hub3aText} />
                             </label>
                             <p className="text-xs my-1">{t.rich('barcode-disclaimer', { br: () => <br /> })}</p>
                         </div> : null

app/ui/ViewLocationCard.tsx

@@ -13,7 +13,7 @@ import { LinkIcon } from "@heroicons/react/24/outline";
 import { uploadUtilBillsProofOfPayment } from "../lib/actions/locationActions";
 import QRCode from "react-qr-code";
 import { TicketIcon } from "@heroicons/react/24/solid";
-import { Pdf417BarcodeWasm } from "./Pdf417BarcodeWasm";
+import { Pdf417Barcode } from "./Pdf417Barcode";
 
 export interface ViewLocationCardProps {
     location: BillingLocation;
@@ -153,7 +153,7 @@ export const ViewLocationCard: FC<ViewLocationCardProps> = ({ location, userSett
                                 <li><strong>{t("payment-reference-label")}</strong><pre className="inline pl-1">{paymentParams.PozivNaBroj}</pre></li>
                             </ul>
                             <label className="label p-2 grow bg-white border border-gray-300 rounded-box justify-center">
-                                <Pdf417BarcodeWasm hub3aText={hub3aText} />
+                                <Pdf417Barcode hub3aText={hub3aText} />
                             </label>
                         </>
                         : null