YuKu: 'the breathing is super slow'. Frame interval down from 150ms
to 50ms (~7fps -> ~20fps pulse). Same change in the vendored
lib/ui-block.sh helper for consistency.
ui_quiet_run now paints a TTY-safe status BLOCK: a background-coloured
SPACE (never a glyph, no font/locale dependency — the braille lesson).
busy : blue block breathing through a 256-colour ramp (48;5;17..33)
with the live dnf action after it
ok : solid green block + package count
fail : solid RED block (spec: YuKu changed the red X to a red block)
followed by the log tail
Colour-depth aware: 256-colour ramp -> 16-colour blue/bright-blue ->
plain ASCII spinner when the terminal reports no colour. LANG=C pty
run shows zero non-ASCII bytes.
Also vendors lib/ui-block.sh (the standalone helper from the Telegram
session prototype; fail changed to red block) and installs the
ui_block_close EXIT trap — with a return 0, because an EXIT trap's
status becomes the script's exit code (harness caught every-successful-
run exiting 1 through that path).
Pathfinder