Refactor: Complete barcodeImage removal and hub3aText migration

This commit completes the migration from storing bitmap barcodes to using
decoded HUB-3A text strings, removing all legacy code while maintaining
backward compatibility during the transition period.

Database & Server Actions:
- billActions: Removed commented legacy barcodeImage code
- locationActions: Updated field references in projections
- monthActions: Use hub3aText when copying bills to new months
- printActions: Support both hub3aText and barcodeImage during migration
  - Added @deprecated annotation to barcodeImage field
  - Filter includes bills with either field
  - Pass both fields to support gradual migration

Barcode Decoder:
- Removed barcodeImage field from DecodeResult type
- Deleted copyBarcodeImage() function (58 lines)
  - No longer generating bitmaps during decode
  - Barcodes now generated on-demand from hub3aText
- Cleaner separation: decoder extracts text, component renders barcode

UI Components:
- Pdf417Barcode: Added optional className prop for styling flexibility
  - Removed unnecessary wrapper div
  - Conditional styling (use className or default dimensions)
- PrintPreview: Use Pdf417Barcode component with fallback to legacy barcodeImage
- ViewBillCard: Major cleanup and migration support
  - Removed unused imports (React, updateOrAddBill, useLocale)
  - Removed unused middleware function
  - Removed unused variables and hidden input
  - Prefer hub3aText with Pdf417Barcode, fallback to barcodeImage
  - Clear legacy support comments

Migration Strategy:
All rendering code now follows the pattern:
1. Prefer hub3aText (new field) when available
2. Fallback to barcodeImage (legacy field) if needed
3. Clear comments marking legacy support code
4. Allows gradual migration without breaking existing bills

Benefits:
- More efficient storage (text vs base64 bitmap)
- Barcodes generated on-demand (not stored)
- Cleaner, more maintainable code
- Consistent use of Pdf417Barcode component
- Removed ~60 lines of unused code

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

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

app/lib/actions/printActions.ts

@@ -9,7 +9,12 @@ import { unstable_noStore as noStore } from 'next/cache';
 export interface PrintBarcodeData {
   locationName: string;
   billName: string;
-  barcodeImage: string;
+  /**
+   * LEGACY SUPPORT ... untill all bills have been migrated 
+   * @deprecated Use `hub3aText` instead.
+  */
+  barcodeImage?: string;
+  hub3aText?: string;
   payedAmount?: number | null;
 }
 
@@ -42,11 +47,15 @@ export const fetchBarcodeDataForPrint = withUser(async (user: AuthenticatedUser,
     for (const location of locations) {
         for (const bill of location.bills) {
             // Only include bills that have barcode images
-            if (bill.barcodeImage && bill.barcodeImage.trim() !== "") {
+            if ( ( bill.hub3aText && bill.hub3aText.trim() !== "") ||
+                // LEGACY SUPPORT ... untill all bills have been migrated
+                 (bill.barcodeImage && bill.barcodeImage.trim() !== "")
+                ) {
                 printData.push({
                     locationName: location.name,
                     billName: bill.name,
-                    barcodeImage: bill.barcodeImage,
+                    barcodeImage: bill.barcodeImage, // LEGACY SUPPORT ... untill all bills have been migrated
+                    hub3aText: bill.hub3aText,
                     payedAmount: bill.payedAmount
                 });
             }