[Bug]: Change error messages for gift code usage errors

[JeanlChristophe]

Describe the bug

There are two gift code–related errors currently handled in the app:
• GIFT_CODE_USED_UP — triggered when a code has already been claimed the maximum number of times.
• GIFT_CODE_ALREADY_USED — triggered when a user tries to claim the same code again.

Both of these error cases should return a consistent and user-friendly error message to the UI, such as:

Please implement the error message handling accordingly in both cases.

Reproduce

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Screenshots / Recording

No response

Operating system

Android, iOS

Bitkit version

No response

Log output