[XenCustomize] Limit Resource Downloads 2.3.3

Resolved an issue where the User group permission "Countdown timer time" was not being applied on the front-end.

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- Now compatible with XenForo 2.3.0 Beta 7+.
- XenForo 2.3.0 Beta 7 is now the minimum requirement for this addon version.

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- Implemented Guest-Specific user-friendly error page for guest users attempting to download attachments:
- Guest-Specific Error Page with an Encouraging Title, Icon, Message, and Custom Buttons: "Click to Close", "Log in" and "Register now".

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Feature Improvement

Enhanced countdown timer logic to respect user group permission.
User group-specific countdown timer time now overrides the global option unless explicitly set to "Unlimited" (-1) or left unset.
Default fallback behavior ensures the global option is used when no valid user group value is provided.

Bug Fixes

Corrected a typo in a phrase on the Download Limits Overview page.
Added a missing phrase to provide clear feedback for users without a...

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