Keep only the bot cookie for the last visited bot

A workspace conversation is never remembered, so /admin/bots always
reopens the bot's own chat.

src/pages/admin/workspaces/[workspace_id]/bots/[bot_id]/index.server.ts

@@ -9,8 +9,8 @@ import type { BunextPageServerFn } from "@moduletrace/bunext/types";
  * A bot's conversation inside a workspace: the bot works with the
  * workspace's context, computers and models. Only the coordinator and the
  * workspace's bots have one; anyone else goes back to the workspace
- * settings (managers) or their bots. Rendering it records the conversation
- * in the last-visited cookies, so `/admin/bots` opens it again.
+ * settings (managers) or their bots. Rendering it records the bot in the
+ * last-visited cookie, so `/admin/bots` opens its own chat again.
  */
 export const server: BunextPageServerFn<PagePropsType> = async (params) => {
     const query: PageQueryObject = params.query;
@@ -37,12 +37,11 @@ export const server: BunextPageServerFn<PagePropsType> = async (params) => {
     }
 
     const bot_id = props.bot.id;
-    const workspace_id = props.workspace?.id ?? query.workspace_id;
 
     return {
         props,
         res_transform(res) {
-            return withLastVisitedBotCookies({ req: params.req, res, bot_id, workspace_id });
+            return withLastVisitedBotCookies({ req: params.req, res, bot_id });
         },
     };
 };