[XB] Alerts Auto-refresh 2.1.1

Improved handling of multiple open tabs: only one tab now checks for updates and shares new counts with all other tabs, greatly reducing server load. Tabs check independently when browser storage is unavailable or too full to share counter updates.

• Added a user preference to enable or disable automatic alert and conversation count refreshing.
• Added an option to pause automatic refreshing while the browser tab is inactive.
• Added optional Server-Sent Events (SSE) support for real-time updates, with automatic fallback to standard polling when unavailable.
• Improved refresh performance by reducing update frequency and response size when no changes are detected.
• Fixed multiple refresh timers accumulating during AJAX navigation.
• Changed the minimum refresh interval from 0 to 5 seconds.

This add-on is now included with the Basic membership ​

By becoming a supporter, you gain access to the full set of add-ons available in your tier for as long as your membership remains active.Once the promotion ends, you can keep using any add-ons you’ve already downloaded, and simply renew your subscription whenever you’d like to continue receiving updates.​

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XF 2.3 support