Menu navigation over a slow link (Bluetooth especially, but serial too)
can sit on a blank frame while the companion answers — the menu screen is
popped and the tool's first prompt not yet pushed. Fill that gap with a
top-of-z-order spinner so the wait reads as work, not a hang.
- RingSpinner: a reusable, screen-agnostic braille circle with a cyan->blue
comet chasing the rim. Plotted a quarter-arc and mirrored for exact 4-fold
symmetry; stroked over a band of radii so it reads clearly as a circle.
- BusyOverlay + TuiSession.busy_overlay: draw the ring as the top-most float,
centered, only in the gaps between screens (empty stack) so it never buries
a prompt. It holds black for 200ms then fades in over 400ms, so quick work
shows nothing and longer work never pops in. The fade restarts every time
the ring is re-exposed (pop/reset), not just on first display.
- Wire it into menu navigation and the post-splash monitor resume for any
real device link (mock simulator opts out); surfaced via ctx.ui.busy_overlay.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Jean-Pierre MartineauandClaude Opus 4.8
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