feat(campaign): make delivery modes explicit

webui/src/api/campaigns.ts

@@ -271,6 +271,24 @@ export type CampaignQueuePayload = {
   dry_run?: boolean;
 };
 
+export type CampaignDeliveryOptions = {
+  campaign_id: string;
+  version_id: string;
+  worker_queue_available: boolean;
+  synchronous_send: {
+    allowed?: boolean;
+    reason?: string | null;
+    message?: string | null;
+    eligible_recipient_job_count?: number;
+    policy?: {
+      max_recipient_jobs?: number;
+      source?: string;
+      deployment_max_recipient_jobs?: number;
+      tenant_max_recipient_jobs?: number | null;
+    };
+  };
+};
+
 export type CampaignSendNowPayload = {
   version_id?: string | null;
   include_warnings?: boolean;
@@ -928,6 +946,15 @@ payload: CampaignQueuePayload = {})
   });
 }
 
+export async function getCampaignDeliveryOptions(
+settings: ApiSettings,
+campaignId: string,
+versionId?: string | null)
+: Promise<CampaignDeliveryOptions> {
+  const query = versionId ? `?version_id=${encodeURIComponent(versionId)}` : "";
+  return apiFetch<CampaignDeliveryOptions>(settings, `/api/v1/campaigns/${campaignId}/delivery-options${query}`);
+}
+
 export async function sendCampaignNow(
 settings: ApiSettings,
 campaignId: string,