Remove fragment from sidebar controls (not supported)

Sidebar controls cannot be in a fragment. Brief blank on
slider change is a Streamlit limitation.

src/py_dvt_ate/app/dashboard/app.py

@@ -93,9 +93,8 @@ def sync_engine_from_session_state() -> None:
     engine.set_load_current(st.session_state.get("load_current", 100.0) / 1000.0)
 
 
-@st.fragment
 def display_controls() -> None:
-    """Display simulation control panel in sidebar (as fragment to avoid full reruns)."""
+    """Display simulation control panel in sidebar."""
     st.sidebar.header("Simulation Controls")
 
     # Start/Stop button