(refactor) Move generateShareId to locationActions and apply to LocationCard

- Moved generateShareId from shareChecksum.ts to locationActions.ts as a server action
- Updated LocationCard to use shareID with checksum for proof of payment download link
- Replaced Link with AsyncLink to handle async shareID generation
- Commented out debug console.log in Pdf417Barcode

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

web-app/app/ui/Pdf417Barcode.tsx

@@ -7,7 +7,7 @@ import { renderBarcode } from '../lib/pdf/renderBarcode';
 export const Pdf417Barcode:FC<{hub3aText:string, className?: string }> = ({  hub3aText: hub3a_text, className }) => {
     const [bitmapData, setBitmapData] = useState<string | undefined>(undefined);
 
-    console.log("Rendering Pdf417Barcode with hub3a_text:", hub3a_text);
+    // console.log("Rendering Pdf417Barcode with hub3a_text:", hub3a_text);
 
     useEffect(() => {
         const aspectRatio = 3;