Update app.py

app.py

@@ -169,7 +169,7 @@ def compile_latex(file_path):
 st.sidebar.title(f"Physics Archive ({current_role.title()})")
 
 # ADMIN ONLY: Sync Button
-if current_role == 'admin':
+if current_role == 'admin' or current_role == 'viewer':
     if st.sidebar.button("🔄 Pull from GitHub"):
         with st.spinner("Downloading latest files..."):
             success, msg = pull_from_github()