fix(webui): reconcile threads after browser resume

tests/utils/test_webui_transcript.py

@@ -389,6 +389,7 @@ def test_thread_response_does_not_mark_completed_message_tool_tail_pending(
 
     assert out is not None
     assert out["has_pending_tool_calls"] is False
+    assert out["completed_turn_ids"] == [turn_id]
     assert out["messages"][-1]["kind"] == "trace"
     assert out["messages"][-2]["content"] == "Cron test"
 
@@ -410,6 +411,144 @@ def test_thread_response_marks_unfinished_tool_tail_pending(tmp_path, monkeypatc
 
     assert out is not None
     assert out["has_pending_tool_calls"] is True
+    assert out["completed_turn_ids"] == []
+
+
+def test_thread_response_reports_active_registry_without_transcript(
+    tmp_path,
+    monkeypatch,
+) -> None:
+    monkeypatch.setattr("nanobot.config.paths.get_data_dir", lambda: tmp_path)
+
+    out = build_webui_thread_response(
+        "websocket:active-without-transcript",
+        active_turn_started_at=1_700_000_000.0,
+        active_turn_id="turn-active",
+    )
+
+    assert out is not None
+    assert out["messages"] == []
+    assert out["completed_turn_ids"] == []
+    assert out["has_pending_tool_calls"] is True
+    assert out["active_turn_id"] == "turn-active"
+
+
+def test_thread_response_reports_explicit_completion_without_assistant_row(
+    tmp_path,
+    monkeypatch,
+) -> None:
+    monkeypatch.setattr("nanobot.config.paths.get_data_dir", lambda: tmp_path)
+    key = "websocket:empty-answer"
+    turn_id = "turn-empty-answer"
+    append_transcript_object(
+        key,
+        {"event": "user", "chat_id": "empty-answer", "text": "stop", "turn_id": turn_id},
+    )
+    append_transcript_object(
+        key,
+        {"event": "turn_end", "chat_id": "empty-answer", "turn_id": turn_id},
+    )
+
+    out = build_webui_thread_response(key)
+
+    assert out is not None
+    assert out["messages"][-1]["role"] == "user"
+    assert out["has_pending_tool_calls"] is False
+    assert out["completed_turn_ids"] == [turn_id]
+
+
+def test_incomplete_turn_with_ambiguous_session_match_stays_pending(
+    tmp_path,
+    monkeypatch,
+) -> None:
+    monkeypatch.setattr("nanobot.config.paths.get_data_dir", lambda: tmp_path)
+    key = "websocket:ambiguous-incomplete"
+    turn_id = "turn-ambiguous"
+    append_transcript_object(
+        key,
+        {
+            "event": "user",
+            "chat_id": "ambiguous-incomplete",
+            "text": "repeat",
+            "turn_id": turn_id,
+        },
+    )
+    append_transcript_object(
+        key,
+        {
+            "event": "turn_end",
+            "chat_id": "ambiguous-incomplete",
+            "turn_id": turn_id,
+            "transcript_incomplete": True,
+        },
+    )
+
+    out = build_webui_thread_response(
+        key,
+        session_messages=[
+            {"role": "user", "content": "repeat"},
+            {"role": "assistant", "content": "first answer"},
+            {"role": "user", "content": "repeat"},
+            {"role": "assistant", "content": "second answer"},
+        ],
+    )
+
+    assert out is not None
+    assert [(message["role"], message["content"]) for message in out["messages"]] == [
+        ("user", "repeat"),
+    ]
+    assert out["completed_turn_ids"] == []
+    assert out["has_pending_tool_calls"] is True
+
+
+def test_later_completion_does_not_hide_older_incomplete_turn(
+    tmp_path,
+    monkeypatch,
+) -> None:
+    monkeypatch.setattr("nanobot.config.paths.get_data_dir", lambda: tmp_path)
+    key = "websocket:older-incomplete"
+    for event in (
+        {"event": "user", "text": "first", "turn_id": "turn-first"},
+        {
+            "event": "turn_end",
+            "turn_id": "turn-first",
+            "transcript_incomplete": True,
+        },
+        {"event": "user", "text": "second", "turn_id": "turn-second"},
+        {"event": "message", "text": "second answer", "turn_id": "turn-second"},
+        {"event": "turn_end", "turn_id": "turn-second"},
+    ):
+        append_transcript_object(
+            key,
+            {"chat_id": "older-incomplete", **event},
+        )
+
+    out = build_webui_thread_response(key)
+
+    assert out is not None
+    assert out["completed_turn_ids"] == ["turn-second"]
+    assert out["has_pending_tool_calls"] is True
+
+
+def test_active_registry_does_not_hide_a_newer_queued_turn(tmp_path, monkeypatch) -> None:
+    monkeypatch.setattr("nanobot.config.paths.get_data_dir", lambda: tmp_path)
+    key = "websocket:queued-tail"
+    for event in (
+        {"event": "user", "text": "first", "turn_id": "turn-old"},
+        {"event": "message", "text": "done", "turn_id": "turn-old"},
+        {"event": "turn_end", "turn_id": "turn-old"},
+        {"event": "user", "text": "queued next", "turn_id": "turn-new"},
+    ):
+        append_transcript_object(key, {"chat_id": "queued-tail", **event})
+
+    out = build_webui_thread_response(
+        key,
+        active_turn_started_at=1_700_000_000.0,
+        active_turn_id="turn-old",
+    )
+
+    assert out is not None
+    assert out["has_pending_tool_calls"] is True
 
 
 def test_replay_preserves_turn_metadata(tmp_path, monkeypatch) -> None: