View changes animate: view cube faces, edges and corners, Home and Fit move the camera over 500 ms (quaternion slerp, ease in-out); mouse navigation cancels; control channel snaps unless animate

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AS5Tn3xieewUSg3uxrMVdL

crates/render/src/lib.rs

@@ -7,5 +7,5 @@
 mod camera;
 mod raster;
 
-pub use camera::{Camera, Mat4, StandardView};
+pub use camera::{Camera, CameraAnim, Mat4, Quat, StandardView, ease_in_out};
 pub use raster::{Canvas, Rgb, Scene, SceneLine, SceneMesh, render, render_png};