chore: remove legacy PDF417 generation implementation

Delete custom PDF417 generator and renderer now that all components use zxing-wasm/writer. Removes Pdf417Barcode component, generateBarcode, and renderBarcode utilities.

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

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

app/ui/Pdf417Barcode.tsx

@@ -1,29 +0,0 @@
-'use client';
-
-import { useState, useEffect, FC } from 'react';
-import { generateBarcode } from '../lib/pdf/pdf417';
-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);
-
-    useEffect(() => {
-        const barcodeMatrix = generateBarcode(hub3a_text);
-        const bitmap = renderBarcode(barcodeMatrix, 2, 2);
-        setBitmapData(bitmap);
-    }, [hub3a_text]);
-
-    // Don't render until bitmap is generated (prevents hydration mismatch)
-    if (!bitmapData) {
-        return (
-            <div style={{ width: "350px", height: "92px" }} className="flex items-center justify-center">
-                <span className="loading loading-spinner loading-lg"></span>
-            </div>
-        );
-    }
-
-    return (
-        // eslint-disable-next-line @next/next/no-img-element
-        <img src={bitmapData} alt="PDF417 Barcode" className={className} style={className ? undefined : { width: "350px", height: "92px" }} />
-    );
-}