fix: give chatbot pickups per-leg surcharges including the return leg

src/Chatbot/TripCatalog.php

@@ -585,6 +585,11 @@ class TripCatalog
     }
 
     /**
+     * BusPro prices a boarding point per leg, so a customer travelling both ways pays the
+     * surcharge twice. Both legs and their sum are spelled out, because a single figure
+     * reads as the whole price. A leg listed without a price is billed nothing, so it is 0;
+     * the return is absent only where the point is not served on the way back.
+     *
      * @param array<string, mixed> $row
      *
      * @return list<array<string, mixed>>
@@ -598,12 +603,17 @@ class TripCatalog
                 continue;
             }
 
+            $outbound = (float) ($pickup['price'] ?? 0);
+            $return = ($pickup['returnLeg'] ?? false) ? (float) ($pickup['returnPrice'] ?? 0) : null;
+
             $pickups[] = array_filter([
                 'city' => $pickup['city'],
                 'place' => $pickup['street'] ?? null,
                 // A clock reading without an offset, as BusPro states it.
                 'departure' => is_string($pickup['datetime'] ?? null) ? str_replace('T', ' ', substr($pickup['datetime'], 0, 16)) : null,
-                'surcharge' => $pickup['price'] ?? null,
+                'surchargeOutbound' => $outbound,
+                'surchargeReturn' => $return,
+                'surchargeRoundTrip' => null !== $return ? round($outbound + $return, 2) : null,
             ], static fn (mixed $value): bool => null !== $value);
         }