feat: make the support require nothing

packages/types/src/passenger/support-chat.ts

@@ -79,6 +79,12 @@ export interface SendPassengerSupportMessageDto {
   text: string;
 }
 
+/** The single device-scoped thread for the portal: conversation + its messages. */
+export interface PassengerSupportThreadDto {
+  conversation: PassengerSupportConversationDto | null;
+  messages: PassengerSupportMessageDto[];
+}
+
 /** Paginated list envelope for the conversations list endpoints. */
 export interface PassengerSupportConversationListResult {
   items: PassengerSupportConversationDto[];