Features:
* Search within a topic (#141, ntfy-android#153, thanks to @Copephobia and @StoyanYonkov for reporting and sponsoring)
* Add "reconnecting to N topics ..." to foreground notification (#1101, thanks to @milosivanovic for reporting)
* Default server dialog with full-screen UI and stricter URL validation (ntfy-android#158)
* Show last notification time for UnifiedPush subscriptions (#1230, #1454, thanks to @Tealk and @user4andre for reporting)
* Support "copy" action button to copy a value to the clipboard (#1364, thanks to @SudoWatson for reporting)

Bug fixes + maintenance:
* Fix clear=true on action buttons not marking notification as read (#1029, thanks to @ElFishi for reporting)
* Fix crash when URL scheme is missing in default server (#1582, ntfy-android#158, thanks to @hard-zero1 for reporting)
* Fix notification timestamp to use original send time instead of receive time (#1112, thanks to @voruti for reporting)
* Fix notifications being missed after service restart (#1591, thanks to @Epifeny for reporting)
