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/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