memory usage logging; attempt at memory leak fix

Author: m-beau

app.py

@@ -20,4 +20,4 @@
 
 # port = int(os.environ.get("PORT", 80))
 # pn.serve(app, port=port, address="0.0.0.0", allow_websocket_origin="*", show=False)
-app.servable()
+app.servable(title="Neuropixels Channelmap Generator")

channelmap_generator/backend.py

@@ -198,7 +198,11 @@ def format_imro_string(electrodes, wiring_df, probe_type, probe_subtype, referen
 
     # Sort by channel and format
     entries.sort(key=lambda x: x[0])
-    entries = [(e[0], e[1], e[2], ref, e[3]) for e, ref in zip(entries, ref_values)]
+    
+    # Only apply ref_values formatting for 4-shank probes
+    if probe_type in ["2.0-4shanks", "NXT"]:
+        entries = [(e[0], e[1], e[2], ref, e[3]) for e, ref in zip(entries, ref_values)]
+    
     header = (probe_subtype, len(entries))
     imro_list = [header] + entries