th code: rainbow working ribbon + Big Smooth pop/tilt/wink intro

[brentrager]

Problem

Brent didn't like the mini Big Smooth face as the working animation and wanted something colorful. He also suggested animating the top Big Smooth (pop up / tilt / wink) once on startup.

Solution

• avatar.rs: the working indicator is now a rainbow double-helix ribbon: two sine strands on a half-block grid, hue sweeping along x and drifting over time, back strand dimmed. 3 rows, 12.5 fps, frame derived from turn elapsed time. Same gating (NO_COLOR / reduced motion).
• New intro.rs: fresh sessions play a ~1.4s intro in its own inline viewport before the app's: pop up from below with overshoot, lean, wink, swing back, then settle on the exact static splash avatar. Only the rest of the splash then goes to scrollback. Skipped on resume, NO_COLOR / reduced motion, non-TTY and small terminals. Any key skips it (the key stays queued).
• render.rs: avatar art hoisted into avatar_lines(shift, wink) so the splash and intro share it; splash split into avatar + welcome_banner_tail_lines.

Verification

cargo test -p smooai-smooth-code --lib: 387 passed. New tests cover: ribbon animates and is colorful, hsv, intro frame widths, rest frame == splash, pop, tilt, wink.

🤖 Generated with Claude Code

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🦋 Changeset detected

Latest commit: 8abe405

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@smooai/smooth	Minor

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