Resolved a fatal entity hydration cache flaw that caused the "Undefined array key" Server Error in the Admin Panel.
Refactored the "Latest Registered Members" structure, abandoning the manual array caching method in favor of the 100% native XenForo architecture.
Purged all hard-coded/legacy raw SQL aggregate queries (SELECT COUNT) and migrated them to the optimized XenForo Finder/ORM method (\XF::finder()->total()).
Integrated the XenForo Core standard indexHint('USE', 'register_date') logic for maximum query performance when retrieving new users.
