Mark the session on screen as Current in the session lists

- The conversation page tells the rail and the sessions modal which
  session it shows (announceShownSession, useShownSession); they reload,
  so a session reopened by ?session_id= shows at once.
- Only that session is Current and greyed out (the active one without
  ?session_id=); the active row then leads back to it.
- The rail lists the session on screen even when it's older than its
  latest sessions.

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

src/pages/admin/bots/[bot_id]/(sections)/conversation.tsx

@@ -40,6 +40,7 @@ import mergeLoadedHistory from "../(utils)/merge-loaded-history";
 import LoadingLine from "@/src/components/general/loading-line";
 import SessionMovedBar from "../(partials)/session-moved-bar";
 import syncSessionQuery from "../(utils)/sync-session-query";
+import announceShownSession from "@/src/functions/frontend/announce-shown-session";
 
 /**
  * The conversation column: header, bottom-anchored thread, composer, the
@@ -172,6 +173,11 @@ export default function Conversation() {
             setSessionId(loaded_session_id);
             setMovedToSessionId(history.moved_to_session_id || null);
             syncSessionQuery({ session: history.session });
+            announceShownSession({
+                bot_id: Number(bot?.id) || 0,
+                workspace_id,
+                session: history.session,
+            });
             setMessages((prev) => mergeLoadedHistory({ shown: prev, history }));
             older.reset({
                 session_id: loaded_session_id,