add PAUSED state to state machine

add paused state to progress items in TUI

Revert "add PAUSED state to state machine"

This reverts commit ddcef527f63d55539a754c62bf8bc6ea5454b903.

add a threading event for pausing the state machine

formatting fix

remove dead code

introduce progress entering pause alongside paused

remove unused code

override textual's command palette to use the key binding

design update for the pausing and paused statuses

design and wording update

remove dead code

remove eventbus dispatch wrapping

stop progress timer when paused

remove unused import