fix: Gracefully handle invalid HF tokens without crashing startup

app.py

@@ -69,7 +69,11 @@ DEFAULT_PERSPECTIVES = ["newton", "empathy", "philosophy", "quantum"]
 # HF Inference API setup
 HF_TOKEN = os.environ.get("HF_TOKEN", "")
 if HF_TOKEN:
-    login(token=HF_TOKEN)
+    try:
+        login(token=HF_TOKEN)
+    except Exception as e:
+        print(f"Warning: HF token invalid or expired ({e.__class__.__name__}). Will attempt without auth.")
+        HF_TOKEN = ""
 try:
     client = InferenceClient("meta-llama/Llama-3.1-8B-Instruct")
     HAS_LLM = True