feat: add campaign copying scheduling and residual handling

webui/src/features/campaigns/utils/draftEditor.ts

@@ -29,6 +29,12 @@ export function ensureCampaignDraft(version: CampaignVersionDetail | null): Reco
     send_without_attachments: true,
     send_without_attachments_behavior: "continue",
     global: [],
+    residual_files: {
+      mode: "none",
+      recipient: null,
+      subject: "Unassigned files in campaign {{local:campaign_name}}",
+      text: "The campaign build found {{local:residual_file_count}} file(s) that were not assigned to a recipient.\n\n{{local:residual_file_list}}"
+    },
     missing_behavior: "warn",
     ambiguous_behavior: "ask",
     ...sourceAttachments