Refactor: Complete barcodeImage to hub3aText migration across codebase

Database & Types:
- Added hub3aText field to Bill interface in db-types.ts
- Marked barcodeImage as @deprecated legacy field

Server Actions:
- Updated billActions to read/write hub3aText instead of barcodeImage
- Commented out legacy barcodeImage code with migration notes

Barcode Decoder:
- Renamed image2canvas to file2canvas for clarity
- Added new image2canvas function for base64 encoded images (migration support)
- Added hub3aText to DecodeResult type
- Exported decodeFromImage function for legacy data migration
- Updated decoding logic to extract and return hub3aText

UI Components:
- Refactored Pdf417Barcode to accept hub3aText string instead of PaymentParams
- Removed EncodePayment call from Pdf417Barcode (now expects pre-encoded text)
- Updated ViewLocationCard to encode payment params before passing to Pdf417Barcode

This completes the refactoring from storing bitmap images to storing decoded
HUB-3A payment strings, providing more efficient storage and easier data manipulation.

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

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

app/ui/ViewLocationCard.tsx

@@ -7,7 +7,7 @@ import { formatCurrency } from "../lib/formatStrings";
 import { useTranslations } from "next-intl";
 import { ViewBillBadge } from "./ViewBillBadge";
 import { Pdf417Barcode } from "./Pdf417Barcode";
-import { PaymentParams } from "hub-3a-payment-encoder";
+import { EncodePayment, PaymentParams } from "hub-3a-payment-encoder";
 import Link from "next/link";
 import { DocumentIcon } from "@heroicons/react/24/outline";
 import { uploadUtilBillsProofOfPayment } from "../lib/actions/locationActions";
@@ -87,6 +87,8 @@ export const ViewLocationCard:FC<ViewLocationCardProps> = ({location, userSettin
         OpisPlacanja: `Režije-${locationNameTrimmed_max20}-${formatYearMonth(yearMonth)}`, // max length 35 = "Režije-" (7) + locationName (20) + "-" (1) + "YYYY-MM" (7)
     };
 
+    const hub3a_text = EncodePayment(paymentParams);
+
     return(
         <div data-key={_id } className="card card-compact card-bordered max-w-[30em] min-w-[350px] bg-base-100 border-1 border-neutral my-1">
             <div className="card-body">
@@ -118,7 +120,7 @@ export const ViewLocationCard:FC<ViewLocationCardProps> = ({location, userSettin
                             <li><strong>{t("payment-reference-label")}</strong><pre className="inline pl-1">{paymentParams.PozivNaBroj}</pre></li>
                             <li><strong>{t("payment-purpose-code-label")}</strong><pre className="inline pl-1">{paymentParams.SifraNamjene}</pre></li>
                         </ul>
-                        <Pdf417Barcode paymentParams={paymentParams} />
+                        <Pdf417Barcode hub3aText={hub3a_text} />
                     </>
                     : null
                 }