More reliable and respectful push notifications

Improvements

• Marketing notification consent gate — Ad-hoc marketing pushes sent from the admin panel now correctly respect each user's marketing preferences, so users who have opted out will no longer receive unwanted notifications.
• Rate limiting & quiet hours for admin pushes — Admin-triggered marketing notifications now honour the same rate limits and quiet hours as automated sends, ensuring a consistent and non-intrusive experience for all users.
• Clearer push error reporting — Error messages from the push provider are now surfaced more clearly, making it easier to understand and act on delivery issues.
• Stricter push payload validation — Array values are now rejected where they aren't supported, and defensive checks prevent unexpected read errors, improving overall reliability of push delivery.

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