Add private-space visibility notice

.gitignore

@@ -1,2 +1,8 @@
 demo_data*.pt
-demo_data*.pt
+
+__pycache__/
+*.pyc
+*.pyo
+*.pyd
+.pytest_cache/
+

app.py

@@ -870,6 +870,16 @@ with gr.Blocks(title="LWM-Spectro Lab") as demo:
     gr.Markdown("# 🔬 LWM-Spectro Interactive Demo")
     gr.Markdown(
         """
+**Having trouble seeing plots/images?**
+
+- This Space is currently **private**. If you're not logged into an account with access, the embedded app may appear blank.
+- Some browsers block authentication cookies inside the Hugging Face embed iframe.
+  If you see empty galleries/plots on `huggingface.co/spaces`, open the direct app URL instead:
+  **https://wi-lab-lwm-spectro.hf.space**
+"""
+    )
+    gr.Markdown(
+        """
     Interactive lab for exploring **LWM spectrogram embeddings** on Sub-6 GHz I/Q baseband data.
     Browse the bundled DeepMIMO-derived samples (LTE / WiFi / 5G, 128×128 spectrograms, 10.5k total),
     compare LWM embeddings against raw spectrogram vectors, and probe precomputed MoE embeddings for joint SNR/mobility.