Nuno Polónia focused on enhancing the reliability and user experience of the calendar component within the significa/foundations repository. During this period, he addressed a persistent issue where unintended form submissions occurred by explicitly setting button types throughout the calendar UI. Using React and TypeScript, Nuno improved the robustness and predictability of interactive elements, ensuring that all calendar buttons behaved consistently within forms. This targeted bug fix reduced workflow disruptions and support incidents related to calendar interactions. His work demonstrated a thoughtful approach to front-end development, emphasizing code maintainability and semantic clarity while directly improving user workflows in JavaScript-based applications.