Fix token issue with rename

ui.py

@@ -103,6 +103,13 @@ def render_rename_sidebar(currFile, speakerNames, all_speaker_tokens):
         )
         enforceGlobalRenameExclusivity(idx)
 
+    # Build a set of every token already claimed by some entry, for fast lookup
+    all_claimed = {
+        token
+        for e in st.session_state.globalRenames
+        for token in e["speakers"]
+    }
+
     for idx, entry in enumerate(st.session_state.globalRenames):
         grkey = _global_rename_key(idx)
         if grkey not in st.session_state:
@@ -114,8 +121,14 @@ def render_rename_sidebar(currFile, speakerNames, all_speaker_tokens):
             on_click=removeGlobalRename, args=(idx,),
             help=f"Remove '{entry['name']}'",
         )
+        # Options = tokens owned by this entry + tokens not claimed by anyone
+        this_entry_tokens = set(entry["speakers"])
+        available_tokens = [
+            t for t in all_speaker_tokens
+            if t not in all_claimed or t in this_entry_tokens
+        ]
         st.sidebar.multiselect(
-            f"Speakers for {entry['name']}", options=all_speaker_tokens,
+            f"Speakers for {entry['name']}", options=available_tokens,
             key=grkey, on_change=_on_grename_change, args=(idx,),
             label_visibility="collapsed",
         )