Two independent causes for the stuck-label / only-refreshes-on-click
behaviour, both fixed here.
1. NSStatusItem button defers the status bar paint for accessory apps
that are not foreground, so after refreshStatusButton sets the new
attributed title the menu bar visually froze until the user opened
the popover (which triggers NSApp.activate and a forced redraw
cycle). Explicit needsDisplay + display() forces the paint every
cycle.
2. The codeburn subprocess inherited the accessory app's default QoS,
which macOS background-throttles. That could stretch a sub-1-second
parse into tens of seconds on large corpora and overrun the 15s
refresh cadence. Set .userInitiated so the CLI runs at the same
priority it does from a user-interactive terminal.