fix: improve print layout and exclude paid bills

- Force white background on print preview page regardless of color scheme
- Exclude paid bills from print view
- Add proper spacing for printed barcodes
- Remove legacy barcodeImage support

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

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

app/ui/PrintPreview.tsx

@@ -24,6 +24,12 @@ export const PrintPreview: React.FC<PrintPreviewProps> = ({ data, year, month, t
   return (
     <>
       {/* Print-specific CSS styles */}
+      <style jsx global>{`
+        html {
+          background-color: white !important;
+          color-scheme: light !important;
+        }
+      `}</style>
       <style jsx>{`
         @media print {
           @page {
@@ -132,7 +138,7 @@ export const PrintPreview: React.FC<PrintPreviewProps> = ({ data, year, month, t
                 <td className="border-2 border-gray-800 px-3 py-1.5 text-center">
                   <div className="flex justify-center items-center">
                     {
-                      item.hub3aText ? <Pdf417Barcode hub3aText={item.hub3aText} /> : null
+                      item.hub3aText ? <Pdf417Barcode hub3aText={item.hub3aText} className="print:m-[5em_auto]" /> : null
                     }
                   </div>
                 </td>