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* feat: Implement announcements Fixes #1203 * Remove unnecessary code * Fix new announcement test * Update web/app/src/views/Home.vue Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> * Remove useless garbage * Require announcement timestamp --------- Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>