Name sessions opened by handed-off work, and hide empty ones from activity

A session the coordinator's delegation, a routine or a hook opened has
no user message and no reply, so it was never named and showed as
"Untitled conversation". Tasks now name their session too, and a session
with no user message is named from the bot's own messages. Until a
session is named, Latest activity shows what it opened with, and
sessions with no messages are left out of it.

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

src/pages/admin/workspaces/[workspace_id]/(partials)/workspace-activity-row.tsx

@@ -1,5 +1,6 @@
 import Span from "@moduletrace/twui/layout/Span";
 import BotAvatar from "@/src/components/general/bot-avatar";
+import { AppData } from "@/src/data/app-data";
 import type { BotFace } from "@/src/dict/bot-dict";
 import botStoneProps from "@/src/utils/bot-stone-props";
 import SettingsListRow from "@/src/pages/admin/settings/(partials)/settings-list-row";
@@ -13,14 +14,18 @@ type Props = {
 };
 
 /**
- * One recent conversation in the workspace: the bot, the session's title,
- * a preview of its latest message and when it last moved.
+ * One recent conversation in the workspace: the bot, the session's title
+ * (what it opened with until it's named), a preview of its latest message
+ * and when it last moved.
  */
 export default function WorkspaceActivityRow({ workspace_id, item }: Props) {
     const at = item.last_activity_at || item.created_at;
     const preview = item.last_message_text
         ? messagePreview({ text: item.last_message_text })
         : "";
+    const opening = item.first_message_text
+        ? messagePreview({ text: item.first_message_text }).slice(0, AppData.BotSessionTitleMaxChars)
+        : "";
 
     return (
         <SettingsListRow
@@ -31,7 +36,7 @@ export default function WorkspaceActivityRow({ workspace_id, item }: Props) {
                     face={(item.bot_face || "idle") as BotFace}
                 />
             }
-            title={item.title || "Untitled conversation"}
+            title={item.title || opening || "Untitled conversation"}
             href={`/admin/workspaces/${workspace_id}/bots/${item.bot_id}`}
             badge={item.unread ? "New" : undefined}
             subtitle={`${item.bot_name || "A bot"}${preview ? ` · ${preview}` : ""}`}