Fix a token bug that can crash the app

ui.py

@@ -72,11 +72,16 @@ def render_role_sidebar(display_speaker_tokens, token_display_map):
     )
     st.sidebar.text(" ")
 
+    valid_display = set(display_speaker_tokens)
     for i, category in enumerate(st.session_state.categories):
         ms_key = f"multiselect_{category}"
-        # Always sync widget key from data model, converting raw -> display
+        # Sync widget key from data model (raw -> display), dropping any stale
+        # labels that are no longer valid (e.g. speaker was just renamed)
         raw_vals = st.session_state.categorySelect[i] if i < len(st.session_state.categorySelect) else []
-        st.session_state[ms_key] = [raw_to_display.get(t, t) for t in raw_vals]
+        st.session_state[ms_key] = [
+            raw_to_display.get(t, t) for t in raw_vals
+            if raw_to_display.get(t, t) in valid_display
+        ]
 
     # Build claimed set (display labels) from widget keys
     all_claimed = {
@@ -141,10 +146,14 @@ def render_rename_sidebar(currFile, speakerNames, display_speaker_tokens, token_
         for token in entry["speakers"]
     }
 
+    valid_display = set(display_speaker_tokens)
     for idx, entry in enumerate(st.session_state.globalRenames):
         grkey = _global_rename_key(idx)
-        # Always sync widget key from data model, converting raw -> display
-        st.session_state[grkey] = [raw_to_display.get(t, t) for t in entry["speakers"]]
+        # Sync widget key from data model (raw -> display), dropping stale labels
+        st.session_state[grkey] = [
+            raw_to_display.get(t, t) for t in entry["speakers"]
+            if raw_to_display.get(t, t) in valid_display
+        ]
         label_col, trash_col = st.sidebar.columns([5, 1])
         label_col.markdown(f"**{entry['name']}**")
         trash_col.button(