Async commands & subscriptions
Side effects done the Verum way — reified, cancellable, async.
Styling & themes
Colors, modifiers, themes, and perceptual downsampling for 16-color terminals.
Layout recipes
Common layout patterns solved with Constraint, Flex, and Grid.
Keyboard & mouse
Handling input at every level — from KeyCode pattern-match to SGR mouse.
Testing TUI apps
Unit tests for `update`, snapshot tests for `view`, and integration tests with a virtual terminal.