fix: improve file browser layout - use selectbox instead of cramped columns

streamlit_app.py

@@ -498,41 +498,56 @@ with tab4:
 
                     if files:
                         st.markdown(f"#### Files in {selected_paper_browse}")
-                        for file_path in files:
-                            col1, col2 = st.columns([3, 1])
+
+                        # Create file selector
+                        file_names = [f.name for f in files]
+                        selected_file_name = st.selectbox(
+                            "Select file to view:",
+                            file_names,
+                            key="file_browser_select",
+                        )
+
+                        # Find the selected file
+                        selected_file_path = None
+                        for f in files:
+                            if f.name == selected_file_name:
+                                selected_file_path = f
+                                break
+
+                        if selected_file_path:
+                            # Show file info and download button
+                            col1, col2 = st.columns([4, 1])
                             with col1:
-                                st.write(f"📄 `{file_path.name}`")
+                                st.markdown(f"**File:** `{selected_file_path.name}`")
                             with col2:
-                                # Read and display file
-                                try:
-                                    if file_path.suffix == ".md":
-                                        with open(file_path, "r") as f:
-                                            content = f.read()
-                                        with st.expander("View", expanded=False):
-                                            st.markdown(content)
-                                    elif file_path.suffix == ".json":
-                                        with open(file_path, "r") as f:
-                                            content = json.load(f)
-                                        with st.expander("View", expanded=False):
-                                            st.json(content)
-                                    elif file_path.suffix == ".txt":
-                                        with open(file_path, "r") as f:
-                                            content = f.read()
-                                        with st.expander("View", expanded=False):
-                                            st.code(content)
-                                    else:
-                                        st.write("(binary or unsupported format)")
-                                except Exception as e:
-                                    st.write(f"(error: {str(e)})")
-
-                            # Download button
-                            with open(file_path, "rb") as f:
-                                st.download_button(
-                                    label="⬇️",
-                                    data=f.read(),
-                                    file_name=file_path.name,
-                                    key=f"download_{file_path.name}",
-                                )
+                                with open(selected_file_path, "rb") as f:
+                                    st.download_button(
+                                        label="📥 Download",
+                                        data=f.read(),
+                                        file_name=selected_file_path.name,
+                                        key=f"download_{selected_file_path.name}",
+                                    )
+
+                            st.markdown("---")
+
+                            # Display file content
+                            try:
+                                if selected_file_path.suffix == ".md":
+                                    with open(selected_file_path, "r") as f:
+                                        content = f.read()
+                                    st.markdown(content)
+                                elif selected_file_path.suffix == ".json":
+                                    with open(selected_file_path, "r") as f:
+                                        content = json.load(f)
+                                    st.json(content)
+                                elif selected_file_path.suffix == ".txt":
+                                    with open(selected_file_path, "r") as f:
+                                        content = f.read()
+                                    st.code(content)
+                                else:
+                                    st.info("Binary or unsupported file format")
+                            except Exception as e:
+                                st.error(f"Error reading file: {str(e)}")
                     else:
                         st.info(f"No files found in {selected_paper_browse}")
                 else: