fix(pdf): remove broken helvetica font registration causing 500 error

lib/pdf-datasheet.tsx

@@ -1,22 +1,8 @@
 import * as React from 'react';
-import {
-  Document,
-  Page,
-  View,
-  Text,
-  Image,
-  StyleSheet,
-  Font,
-} from '@react-pdf/renderer';
+import { Document, Page, View, Text, Image, StyleSheet, Font } from '@react-pdf/renderer';
 
-// Register fonts (using system fonts for now, can be customized)
-Font.register({
-  family: 'Helvetica',
-  fonts: [
-    { src: '/fonts/Helvetica.ttf', fontWeight: 400 },
-    { src: '/fonts/Helvetica-Bold.ttf', fontWeight: 700 },
-  ],
-});
+// Standard fonts like Helvetica are built-in to PDF and don't require registration
+// unless we want to use specific TTF files. Using built-in Helvetica for maximum stability.
 
 // Industrial/technical/restrained design - STYLEGUIDE.md compliant
 const styles = StyleSheet.create({
@@ -302,10 +288,7 @@ const getLabels = (locale: 'en' | 'de') => {
   return labels[locale];
 };
 
-export const PDFDatasheet: React.FC<PDFDatasheetProps> = ({
-  product,
-  locale,
-}) => {
+export const PDFDatasheet: React.FC<PDFDatasheetProps> = ({ product, locale }) => {
   const labels = getLabels(locale);
 
   return (
@@ -317,9 +300,7 @@ export const PDFDatasheet: React.FC<PDFDatasheetProps> = ({
             <View>
               <Text style={styles.logoText}>KLZ</Text>
             </View>
-            <Text style={styles.docTitle}>
-              {labels.productDatasheet}
-            </Text>
+            <Text style={styles.docTitle}>{labels.productDatasheet}</Text>
           </View>
 
           <View style={styles.productRow}>
@@ -328,7 +309,8 @@ export const PDFDatasheet: React.FC<PDFDatasheetProps> = ({
                 <View style={styles.categories}>
                   {product.categories.map((cat, index) => (
                     <Text key={index} style={styles.productMeta}>
-                      {cat.name}{index < product.categories.length - 1 ? ' • ' : ''}
+                      {cat.name}
+                      {index < product.categories.length - 1 ? ' • ' : ''}
                     </Text>
                   ))}
                 </View>
@@ -337,12 +319,8 @@ export const PDFDatasheet: React.FC<PDFDatasheetProps> = ({
             </View>
             <View style={styles.productImageCol}>
               {product.featuredImage ? (
-                <Image
-                  src={product.featuredImage}
-                  style={styles.heroImage}
-                />
+                <Image src={product.featuredImage} style={styles.heroImage} />
               ) : (
-
                 <Text style={styles.noImage}>{labels.noImage}</Text>
               )}
             </View>
@@ -356,7 +334,11 @@ export const PDFDatasheet: React.FC<PDFDatasheetProps> = ({
               <Text style={styles.sectionTitle}>{labels.description}</Text>
               <View style={styles.sectionAccent} />
               <Text style={styles.description}>
-                {stripHtml(product.applicationHtml || product.shortDescriptionHtml || product.descriptionHtml)}
+                {stripHtml(
+                  product.applicationHtml ||
+                    product.shortDescriptionHtml ||
+                    product.descriptionHtml,
+                )}
               </Text>
             </View>
           )}
@@ -372,17 +354,14 @@ export const PDFDatasheet: React.FC<PDFDatasheetProps> = ({
                     key={index}
                     style={[
                       styles.specsTableRow,
-                      index === product.attributes.length - 1 &&
-                      styles.specsTableRowLast,
+                      index === product.attributes.length - 1 && styles.specsTableRowLast,
                     ]}
                   >
                     <View style={styles.specsTableLabelCell}>
                       <Text style={styles.specsTableLabelText}>{attr.name}</Text>
                     </View>
                     <View style={styles.specsTableValueCell}>
-                      <Text style={styles.specsTableValueText}>
-                        {attr.options.join(', ')}
-                      </Text>
+                      <Text style={styles.specsTableValueText}>{attr.options.join(', ')}</Text>
                     </View>
                   </View>
                 ))}

lib/pdf-page.tsx

@@ -1,14 +1,8 @@
 import * as React from 'react';
 import { Document, Page, View, Text, StyleSheet, Font, Link } from '@react-pdf/renderer';
 
-// Register fonts (using system fonts for now, can be customized)
-Font.register({
-  family: 'Helvetica',
-  fonts: [
-    { src: '/fonts/Helvetica.ttf', fontWeight: 400 },
-    { src: '/fonts/Helvetica-Bold.ttf', fontWeight: 700 },
-  ],
-});
+// Standard fonts like Helvetica are built-in to PDF and don't require registration
+// unless we want to use specific TTF files. Using built-in Helvetica for maximum stability.
 
 // ─── Brand Tokens (matching datasheet) ──────────────────────────────────
 const C = {