Impl
* Remove settings menu item, start splitting search UI. Also, add `applyIf` and `circularReveal` modifiers. * Split UI & logic for room list search * Suppress `composed` warning, improve its debuggability * Add content description to the user's avatar, fix window insets. Also, remove unused `SearchRoomListTopBar`.
* Implement the network status indicator. * Add `networkmonitor` feature.