🎨 Palette: Add Loading State to Login Button

[google-labs-jules]

💡 What

Added a loading state to the login button that disables it and displays "Logging in..." during form submission.

🎯 Why

To provide clear visual feedback to the user, prevent multiple submissions, and improve the overall user experience of the login process.

📸 Before/After

♿ Accessibility

The disabled attribute on the button improves accessibility by preventing keyboard and screen reader interaction with the button while the form is submitting.

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PR created automatically by Jules for task 8038404088765266700 started by @BilalkhanIO

[google-labs-jules]

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