iBouncy

Update index.html to refine UI styles, including adjustments to padding, gap, and dimensions for various components such as buttons, pills, and badges. Enhance visual consistency and responsiveness across the interface.

Refactor database schema management by replacing partial unique index with a full unique index for client_id, ensuring correct upsert behavior. Update cloud overlay to enhance syncLocalToCloud function, returning detailed sync results including uploaded count, pending records, and error messages.

Enhance authentication features by adding username and nickname support, updating login and registration processes, and improving user payload handling. Update UI components for better user experience and integrate new styles for modals and forms.