Split monitor UI into separate HTML and JS assets

tests/test_server_api.py

@@ -276,6 +276,9 @@ def test_ui_toggle(tmp_path: Path, monkeypatch: Any) -> None:
     root_enabled = client_enabled.get("/")
     assert root_enabled.status_code == 200
     assert "ScreenJob Monitor" in root_enabled.text
+    js_enabled = client_enabled.get("/ui/monitoring.js")
+    assert js_enabled.status_code == 200
+    assert "const tokenInput" in js_enabled.text
 
     app_disabled, _ = _build_app(tmp_path / "disabled", monkeypatch, disable_ui=True)
     client_disabled = TestClient(app_disabled)