ui: label the condenser radio option as "(default)"

app.py

@@ -1913,7 +1913,12 @@ with gr.Blocks(
                 )
                 memory_strategy = gr.Radio(
                     label="Memory Strategy",
-                    choices=list(MEMORY_STRATEGIES),
+                    choices=[
+                        ("condenser (default)", "condenser"),
+                        ("vanilla", "vanilla"),
+                        ("discard_all", "discard_all"),
+                        ("hide_tool_result", "hide_tool_result"),
+                    ],
                     value="condenser",
                     elem_id="quest-memory-strategy",
                 )