fix(webui): persist large sidebar ordering state

nanobot/channels/websocket/runtime.py

@@ -81,6 +81,7 @@ from nanobot.webui.session_access import (
     WebuiSessionAccess,
     session_mentions_runtime_context,
 )
+from nanobot.webui.sidebar_state import write_webui_sidebar_state
 from nanobot.webui.transcript import WEBUI_TRANSCRIPT_INCOMPLETE_KEY
 from nanobot.webui.transcription_ws import webui_transcription_event
 from nanobot.webui.websocket_logging import websockets_server_logger
@@ -775,6 +776,30 @@ class WebSocketChannel(BaseChannel):
             await self._send_event(connection, "attached", chat_id=cid)
             await self._hydrate_after_subscribe(cid)
             return
+        if t == "set_sidebar_state":
+            if connection not in self._webui_connections:
+                await self._send_event(connection, "error", detail="access_denied")
+                return
+            state = envelope.get("state")
+            if not isinstance(state, dict):
+                await self._send_event(
+                    connection,
+                    "error",
+                    detail="invalid_sidebar_state",
+                )
+                return
+            try:
+                await asyncio.to_thread(
+                    write_webui_sidebar_state,
+                    cast(dict[str, Any], state),
+                )
+            except (OSError, ValueError):
+                await self._send_event(
+                    connection,
+                    "error",
+                    detail="invalid_sidebar_state",
+                )
+            return
         if t == "set_workspace_scope":
             cid = envelope.get("chat_id")
             if not _is_valid_chat_id(cid):

nanobot/channels/websocket/tests/test_websocket_channel.py

@@ -559,6 +559,34 @@ def test_only_bootstrap_tokens_mark_webui_connections(bus: MagicMock) -> None:
     assert client_connection not in channel._webui_connections
 
 
+@pytest.mark.asyncio
+async def test_webui_persists_sidebar_state_larger_than_http_request_line(
+    bus: MagicMock,
+    tmp_path: Path,
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    monkeypatch.setattr("nanobot.config.paths.get_data_dir", lambda: tmp_path)
+    channel = _ch(bus)
+    conn = AsyncMock()
+    channel._webui_connections.add(conn)
+    session_order = [f"websocket:{index:04d}-{'x' * 48}" for index in range(160)]
+    envelope = {
+        "type": "set_sidebar_state",
+        "state": {
+            "session_order": session_order,
+            "view": {"sort": "manual"},
+        },
+    }
+    assert len(json.dumps(envelope).encode()) > 8_192
+
+    await channel._dispatch_envelope(conn, "webui-client", envelope)
+
+    saved = json.loads((tmp_path / "webui" / "sidebar-state.json").read_text(encoding="utf-8"))
+    assert saved["session_order"] == session_order
+    assert saved["view"]["sort"] == "manual"
+    conn.send.assert_not_awaited()
+
+
 @pytest.mark.asyncio
 async def test_client_cannot_self_assert_webui_quote_context(bus: MagicMock) -> None:
     channel = _ch(bus)