Update documentation and ErrorBoundary component

- Updated architecture documentation with refactoring notes
- Updated task documentation with progress
- Enhanced ErrorBoundary component for better error handling

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

frontend/src/components/ErrorBoundary.tsx

@@ -107,9 +107,18 @@ export class ErrorBoundary extends React.Component<ErrorBoundaryProps, ErrorBoun
   componentDidCatch(error: Error, errorInfo: React.ErrorInfo): void {
     const { onError } = this.props;
 
+    // Extract componentStack from errorInfo
+    // Note: componentStack is not part of the public React.ErrorInfo type definition,
+    // but is available at runtime via React DevTools. We cast to any to access it.
+    // This captures the React component hierarchy where the error occurred, which is
+    // valuable for debugging but may change in future React versions.
+    // TODO: Consider removing when React types include componentStack in ErrorInfo
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any, @typescript-eslint/no-unsafe-member-access
+    const componentStack = (errorInfo as any).componentStack as string | undefined;
+
     // Log the error using telemetry for distributed tracing
     recordCritical("component_render_error", error, {
-      component_stack: errorInfo.componentStack,
+      component_stack: componentStack,
       error_message: error.message,
     });