fix(scheduling-webui): submit participant revisions

webui/src/features/scheduling/schedulingViewModel.ts

@@ -11,6 +11,7 @@ const DIRECTORY_SELECTION_METADATA_KEY = "directory_selection";
 export type SchedulingParticipantDraft = PeoplePickerItem & {
   draftId: string;
   sourceId?: string;
+  revision?: string;
   respondent_id?: string | null;
   display_name: string;
   email: string;
@@ -95,6 +96,7 @@ export function participantDraftFromResponse(
     source_revision: selection?.source_revision ?? null,
     draftId,
     sourceId: participant.id,
+    revision: participant.revision ?? undefined,
     respondent_id: participant.respondent_id,
     participant_type: normalizedParticipantType(participant.participant_type),
     required: participant.required ?? true,
@@ -129,9 +131,11 @@ export function participantDraftsFromPicker(
 
 export function participantPayload(
   participant: SchedulingParticipantDraft
-): SchedulingParticipantPayload & { id?: string } {
+): SchedulingParticipantPayload & { id?: string; revision?: string } {
   return {
-    ...(participant.sourceId ? { id: participant.sourceId } : {}),
+    ...(participant.sourceId
+      ? { id: participant.sourceId, revision: participant.revision }
+      : {}),
     respondent_id: participant.respondent_id ?? null,
     display_name: participant.display_name.trim() || null,
     email: participant.email.trim() || null,