🛠 Improved Chat Preferences UI

We’ve made several enhancements to the chat preferences interface to improve clarity and usability:

• Save button is now always visible, even when no changes have been made.
• Layout fixes ensure the save button is no longer cut off on smaller screens or tight layouts.
• Better spacing and visual separation added for the button area to improve readability.
• Auto-close on save: Preferences window now closes automatically after saving successfully.
• Cancel now resets unsaved changes, giving users a clean rollback option.
• Overall UX improvements for a smoother, more intuitive preferences experience.