Harden optimized review game selection

Agent-Logs-Url: https://github.com/fsmosca/Python-Easy-Chess-GUI/sessions/fe404be6-5d97-4f31-bafa-06f431201259

Co-authored-by: fsmosca <22366935+fsmosca@users.noreply.github.com>

Author: Copilot

python_easy_chess_gui.py

@@ -2616,7 +2616,14 @@ def select_review_game(self, pgn_file=None, games=None):
                     w['status_k'].Update('Status: Please select a game.')
                     continue
 
-                selected_index = selection_list.index(selected_text)
+                try:
+                    selected_index = int(selected_text.split('.', 1)[0]) - 1
+                except (IndexError, ValueError):
+                    w['status_k'].Update('Status: Please select a valid game.')
+                    continue
+                if not 0 <= selected_index < len(selected_games):
+                    w['status_k'].Update('Status: Please select a valid game.')
+                    continue
                 selected_game_obj = self.load_review_game(
                     selected_pgn, selected_games[selected_index])
                 if selected_game_obj is None: