fix(webui): handle final stream image rewrites

tests/channels/test_websocket_channel.py

@@ -512,6 +512,40 @@ async def test_send_delta_stream_end_rewrites_local_markdown_image(monkeypatch,
     assert final["text"].startswith("![Diagram](/api/media/")
 
 
+@pytest.mark.asyncio
+async def test_send_delta_stream_end_rewrites_inline_final_text(monkeypatch, tmp_path) -> None:
+    bus = MagicMock()
+    workspace = tmp_path / "workspace"
+    workspace.mkdir()
+    (workspace / "diagram.png").write_bytes(b"\x89PNG\r\n\x1a\nimage")
+    media = tmp_path / "media"
+
+    def fake_media_dir(channel: str | None = None):
+        path = media / channel if channel else media
+        path.mkdir(parents=True, exist_ok=True)
+        return path
+
+    monkeypatch.setattr("nanobot.channels.websocket.get_media_dir", fake_media_dir)
+    channel = WebSocketChannel(
+        {"enabled": True, "allowFrom": ["*"], "streaming": True},
+        bus,
+        workspace_path=workspace,
+    )
+    mock_ws = AsyncMock()
+    channel._attach(mock_ws, "chat-1")
+
+    await channel.send_delta(
+        "chat-1",
+        "![Diagram](diagram.png)",
+        {"_stream_delta": True, "_stream_end": True, "_stream_id": "sid"},
+    )
+
+    mock_ws.send.assert_awaited_once()
+    final = json.loads(mock_ws.send.await_args.args[0])
+    assert final["event"] == "stream_end"
+    assert final["text"].startswith("![Diagram](/api/media/")
+
+
 @pytest.mark.asyncio
 async def test_send_reasoning_delta_emits_streaming_frame() -> None:
     bus = MagicMock()

tests/utils/test_webui_transcript.py

@@ -55,6 +55,17 @@ def test_replay_augments_assistant_text() -> None:
     assert msgs[1]["content"] == "![Diagram](/api/media/sig/payload)"
 
 
+def test_replay_uses_stream_end_final_text() -> None:
+    msgs = replay_transcript_to_ui_messages(
+        [
+            {"event": "user", "chat_id": "t-img", "text": "draw"},
+            {"event": "stream_end", "chat_id": "t-img", "text": "![Diagram](/api/media/sig/payload)"},
+        ],
+    )
+
+    assert msgs[1]["content"] == "![Diagram](/api/media/sig/payload)"
+
+
 def test_replay_file_edit_event_creates_file_activity(tmp_path, monkeypatch) -> None:
     monkeypatch.setattr("nanobot.config.paths.get_data_dir", lambda: tmp_path)
     key = "websocket:t-file"