- Added startTime and endTime properties to announcements for time-bound visibility.
- Introduced audience targeting to control who sees announcements (all, users, web_visitors).
- Updated related components and hooks to support new announcement features.
- Removed unused state tracking for dismissed announcements to streamline functionality.
- Changed announcement ID to a more descriptive format.
- Revised the announcement description for clarity.
- Updated the date to reflect the new announcement timing.
- Modified the link label and URL for better navigation to the announcements page.
