Style Netto the same size/weight as the MwSt annotation

Was using summaryLabel/summaryValue (fontSize 10, same as Zwischensumme/
Versand — the build-up rows above Gesamt), which visually competed
with Gesamt instead of reading as supplementary detail below it. Now
uses the same small/muted vatNoteLabel/vatNoteValue as the "enthält
X% MwSt." line right above it — both are detail underneath the hero
Gesamt figure, same visual tier.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/invoicePdf.tsx

@@ -416,10 +416,15 @@ export function InvoiceDocument({ order, seller }: { order: InvoiceOrder; seller
                   consistency across every invoice this shop issues. Placed
                   last (after the MwSt annotation, not before it) — see
                   that annotation's own comment above for why the order
-                  matters here. */}
+                  matters here. Styled with the same small/muted
+                  vatNoteLabel/vatNoteValue as that annotation, not the
+                  larger summaryLabel/summaryValue the build-up rows above
+                  Gesamt use — Netto is supplementary detail *below* the
+                  hero Gesamt figure, same visual tier as the tax
+                  breakdown, not another primary line competing with it. */}
               <View style={styles.nettoRow}>
-                <Text style={styles.summaryLabel}>Netto</Text>
-                <Text style={styles.summaryValue}>{formatPrice(rateGroups.reduce((sum, g) => sum + g.net, 0))}</Text>
+                <Text style={styles.vatNoteLabel}>Netto</Text>
+                <Text style={styles.vatNoteValue}>{formatPrice(rateGroups.reduce((sum, g) => sum + g.net, 0))}</Text>
               </View>
             </View>
             {paid && (