some fixes

python_app/gui/controllers/app_window_web_mixin.py

@@ -17,13 +17,12 @@ from __future__ import annotations
 
 import base64
 import contextlib
-import dataclasses
 import os
 import time
 
 from PyQt6.QtCore import QBuffer, QIODevice, QObject, pyqtSignal
 
-from python_app.orchestration.live_processing_config import ProcessingLiveConfig
+from python_app.gui.controllers.app_window_config.live_processing_mixin import web_apply_field_names
 
 _WEBUI_PORT_ENV = "RADAR_SYSTEM_WEBUI_PORT"
 _DEFAULT_PORT = 8080
@@ -32,7 +31,9 @@ _DEFAULT_PORT = 8080
 _HEADLESS_PLOT_SIZE = (1600, 900)
 # Grab/encode the plot at most this often (the plot only changes per result/redraw).
 _GRAB_INTERVAL_S = 0.2
-_LIVE_FIELD_NAMES = frozenset(field.name for field in dataclasses.fields(ProcessingLiveConfig))
+# Field names a web client may apply: the form's live/display/stable fields plus the
+# history command. Derived from the single schema so it can never drift from the form.
+_LIVE_FIELD_NAMES = web_apply_field_names()
 
 
 class AppWindowWebController(QObject):