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/ui/PrintPreview.tsx

@@ -1,6 +1,7 @@
 'use client';
 
 import { PrintBarcodeData } from '../lib/actions/printActions';
+import { Pdf417Barcode } from './Pdf417Barcode';
 
 export interface PrintPreviewProps {
   data: PrintBarcodeData[];
@@ -141,12 +142,21 @@ export const PrintPreview: React.FC<PrintPreviewProps> = ({ data, year, month, t
                 </td>
                 <td className="border-2 border-gray-800 px-3 py-1.5 text-center">
                   <div className="flex justify-center items-center">
-                    <img
-                      src={item.barcodeImage.startsWith('data:') ? item.barcodeImage : `data:image/png;base64,${item.barcodeImage}`}
-                      alt={`Barcode for ${item.billName}`}
-                      className="max-h-28 w-auto border border-gray-300 rounded print-barcode-img"
-                      style={{ maxWidth: '270px' }}
-                    />
+                    {
+                    item.hub3aText ?
+                        <Pdf417Barcode hub3aText={item.hub3aText} className="max-h-28 w-auto border border-gray-300 rounded print-barcode-img" />
+                        : (
+                          // LEGACY SUPPORT ... untill all bills have been migrated
+                          item.barcodeImage ?
+                            <img
+                              src={item.barcodeImage.startsWith('data:') ? item.barcodeImage : `data:image/png;base64,${item.barcodeImage}`}
+                              alt={`Barcode for ${item.billName}`}
+                              className="max-h-28 w-auto border border-gray-300 rounded print-barcode-img"
+                              style={{ maxWidth: '270px' }}
+                            /> : null
+                        )
+                    }
+
                   </div>
                 </td>
               </tr>