Carry conversations into new sessions with a visible summary

- Bots get continue_in_new_session: the bot writes a title and summary,
  the session closes for good (read-only) and the new one opens with the
  summary as a "Carried over from the last session" message that links
  back to the old session.
- Continue in new session (conversation menu, sessions modal) and the
  automatic rollover at the session length do the same; New session now
  starts a fresh, unlinked session.
- Session length is an app setting in Settings > General.
- ?session_id= opens a session; a carried-over one shows a bar linking to
  where the conversation went on instead of the composer.
- The thread can open the previous session above the current one (shown
  only, never in the prompt), and replies get search_past_sessions and
  read_past_session.
- Sessions are named from their opening messages, not their latest, and
  a carried summary is labelled as the earlier session's.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/pages/admin/bots/[bot_id]/(functions)/fetch-conversation-history.ts

@@ -1,20 +1,22 @@
 import fetchApi from "@moduletrace/twui/utils/fetch/fetchApi";
 import type { APIResponseObject } from "@moduletrace/bunext/types";
-import type { BotConversationRequest } from "@/src/schemas/bot-schema";
+import type { ConversationHistoryRequest } from "@/src/schemas/bot-schema";
 import type { ConversationHistoryPayload } from "@/src/types";
 
 /**
- * A conversation's history, loaded once the page is on screen.
+ * A conversation's history, loaded once the page is on screen: its active
+ * session, or the one `session_id` names.
  */
 export default async function fetchConversationHistory({
     bot_id,
     workspace_id,
-}: BotConversationRequest) {
+    session_id,
+}: ConversationHistoryRequest) {
     return await fetchApi<
-        BotConversationRequest,
+        ConversationHistoryRequest,
         APIResponseObject<ConversationHistoryPayload>
     >(`/api/admin/bots/conversation-history`, {
         method: "POST",
-        body: { bot_id, workspace_id },
+        body: { bot_id, workspace_id, session_id },
     });
 }