From 6807f915e1dd107380418b68a4b802cf6efd5973 Mon Sep 17 00:00:00 2001
From: Xubin Ren <52506698+Re-bin@users.noreply.github.com>
Date: Fri, 14 Aug 2026 03:15:38 +0900
Subject: [PATCH] fix(webui): bound restored session previews

---
 nanobot/webui/session_list_index.py    |  7 +++++--
 tests/webui/test_session_list_index.py | 23 +++++++++++++++++++++++
 2 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/nanobot/webui/session_list_index.py b/nanobot/webui/session_list_index.py
index c6c7fc650..eb343b530 100644
--- a/nanobot/webui/session_list_index.py
+++ b/nanobot/webui/session_list_index.py
@@ -496,14 +496,17 @@ def _transcript_preview(record: dict[str, Any]) -> tuple[str, str]:
     text = record.get("text")
     if not isinstance(text, str) or not text.strip():
         return "", ""
+    preview = _message_preview_text({"content": text})
+    if not preview:
+        return "", ""
     event = record.get("event")
     if event == "user" or record.get("role") == "user":
-        return text, ""
+        return preview, ""
     if (
         event == "message"
         and record.get("kind") not in _TRANSCRIPT_NON_ANSWER_KINDS
     ) or record.get("role") == "assistant":
-        return "", text
+        return "", preview
     return "", ""
 
 
diff --git a/tests/webui/test_session_list_index.py b/tests/webui/test_session_list_index.py
index 6e1d71215..10c97b61a 100644
--- a/tests/webui/test_session_list_index.py
+++ b/tests/webui/test_session_list_index.py
@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import io
+import json
 import os
 from datetime import datetime
 from pathlib import Path
@@ -266,6 +267,28 @@ def test_webui_session_list_recovers_colon_chat_id_from_transcript(
     assert row["preview"] == "scoped history"
 
 
+def test_webui_session_list_normalizes_transcript_preview(tmp_path: Path) -> None:
+    key = "websocket:long-preview"
+    transcript = tmp_path / "webui" / f"{SessionManager.safe_key(key)}.jsonl"
+    transcript.write_text(
+        json.dumps(
+            {
+                "event": "user",
+                "chat_id": "long-preview",
+                "text": "first\n\n" + "word " * 100,
+            }
+        )
+        + "\n",
+        encoding="utf-8",
+    )
+
+    [row] = list_webui_sessions(SessionManager(tmp_path / "workspace"))
+
+    assert row["preview"].startswith("first word")
+    assert "\n" not in row["preview"]
+    assert row["preview"].endswith("…")
+
+
 def test_webui_session_list_tolerates_invalid_transcript_timestamp(
     tmp_path: Path,
 ) -> None: