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/lib/db-types.ts

@@ -98,6 +98,11 @@ export interface Bill {
     hasAttachment?: boolean;
     /** (optional) notes */
     notes?: string|null;
-    /** (optional) image data containing PDF471 bar code */
+    /** 
+     * (optional) image data containing PDF471 bar code
+     * @deprecated LEGACY FIELD - use hub3aText instead
+     * */
     barcodeImage?:string;
+    /** (optional) HUB-3A text for generating PDF417 bar code */
+    hub3aText?:string;
 };