refactor: Update clipboard copy method to use modern Clipboard API

src/streamlit_app.py

@@ -531,17 +531,17 @@ if st.session_state.error_log:
         
         js_code = f"""
             <script>
-                // Create a temporary textarea element
-                const textarea = document.createElement('textarea');
-                textarea.value = `{escaped_error_text}`;
-                document.body.appendChild(textarea);
-                
-                // Select and copy the text
-                textarea.select();
-                document.execCommand('copy');
-                
-                // Clean up
-                document.body.removeChild(textarea);
+                async function copyToClipboard() {{
+                    try {{
+                        const text = `{escaped_error_text}`;
+                        await navigator.clipboard.writeText(text);
+                        return true;
+                    }} catch (err) {{
+                        console.error('Failed to copy text: ', err);
+                        return false;
+                    }}
+                }}
+                copyToClipboard();
             </script>
         """
         st.components.v1.html(js_code, height=0)