Name sessions with the model and keep the rail list live

Sessions no longer take their title from the first message: once the first exchange is sent, the text model writes the title and summary, which the rail and sessions list show. The summary records how many messages it covers so a stale one is rewritten before it is carried into the next session.

The sessions hook now reloads on live message and session events, so a session started by the first message, a rollover or another tab appears without a reload. New sessions are pushed as server:bot-session, both from the process that changed them and through the live relay.

src/bots-queue/push-bot-session.ts

@@ -0,0 +1,29 @@
+import type { BotSessionChangedData } from "@/src/types";
+import pushToSessionUser from "./push-to-session-user";
+
+type Params = {
+    session_id: number | string;
+    bot_id: number | string;
+    workspace_id?: number | string | null;
+};
+
+/**
+ * Tells the open tabs of the user a session belongs to that it started or
+ * changed, so the rail and the sessions list reload it.
+ */
+export default async function pushBotSession({
+    session_id,
+    bot_id,
+    workspace_id,
+}: Params) {
+    const data: BotSessionChangedData = {
+        session_id: Number(session_id),
+        bot_id: Number(bot_id),
+        workspace_id: workspace_id ? Number(workspace_id) : null,
+    };
+
+    await pushToSessionUser({
+        session_id,
+        data: { event: "server:bot-session", data },
+    });
+}