Internal: Improve Notifications loading in Hello theme [ED-22569]

[hein-obox]

✨ PR Description

Purpose: Fix notifications initialization in Hello Theme admin by adding robust autoloader fallback mechanism to prevent class loading failures.

Main changes:

• Added cascading autoloader check for WPNotificationsPackage class from Elementor plugin then Hello Theme vendor paths
• Implemented null-safe notificator property initialization with early return guard in get_notifications_by_conditions method
• Replaced direct use statement with fully qualified class name for better autoloader compatibility

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