Load the lead's scrollback 50 turns at a time

web/dist/lead.js

@@ -1,6 +1,6 @@
 import { post } from "./api.js";
 import { h } from "./dom.js";
-import { currentLead, leadLoading, state } from "./state.js";
+import { currentLead, leadHasOlder, leadLoading, loadOlderLead, state } from "./state.js";
 import { compactButton, mountChat } from "./task.js";
 const leadSource = {
     key: () => "lead",
@@ -14,6 +14,7 @@ const leadSource = {
     transcriptTopic: "lead.transcript",
     streamTopic: "lead.stream",
     readyTopic: "lead.ready",
+    older: { has: leadHasOlder, load: loadOlderLead },
     empty: "",
     canSend: () => true,
     placeholder: "Message your lead. Paste or drop images to attach them.",