Remove explicit launch() — let HF SDK serve the demo

app.py

@@ -449,7 +449,15 @@ with gr.Blocks(title="Bangla Book Recommender") as demo:
     )
 
 
-if __name__ == "__main__":
-    # On Hugging Face Spaces, the SDK manages the launch — keep this minimal.
-    # No theme, no extra params; HF injects what's needed.
-    demo.launch()
+# ─────────────────────────────────────────────────────────────────────────────
+# Note: We deliberately do NOT call demo.launch() here.
+#
+# On Hugging Face Spaces with Gradio 6.x, the platform's runtime spawns the
+# server itself by importing this module and serving the `demo` object.
+# Calling .launch() ourselves triggers a localhost-reachability check that
+# fails inside the Space's container, raising:
+#   "When localhost is not accessible, a shareable link must be created..."
+#
+# For local development, run: `gradio app.py` (which calls launch() for you)
+# or add `demo.launch()` back temporarily.
+# ─────────────────────────────────────────────────────────────────────────────