Ian MacLeod 147137c1f4 Add Astra sparkle effects to the TUI composer (#42842) ...

## What changed

- Render sparse, fading stars across the composer when using an Astra model in a true-color terminal.
- Preserve composer content, cursor state, effort effects, and terminal colors, and pause the animation while popups are open.
- Add the default-on `tui.whimsy` setting so decorative effects can be disabled independently. Sparkles also respect `tui.animations`.

## Testing

- Cover model and setting eligibility, terminal color handling, protected composer cells, popup behavior, effort effects, and layout stability.

GitOrigin-RevId: fe0471ebef0bca21c44e1d8f731d46959eba0165

2026-09-04 20:18:13 +00:00

..

main.rs

Add Astra sparkle effects to the TUI composer (#42842)

2026-09-04 20:18:13 +00:00