feat(k-ui): motion: ring springs to focus, toggle knob slides, screens slide+fade in (theme motion tokens, 0 = off); 16ms frame timer only while moving; motion-only frames drawn+presented in part (whole elements, pixel-snapped rects, == full draw); virtio fb flushes only damage; TICKS_PER_MS in types

crates/k-ui/src/lib.rs

@@ -10,6 +10,7 @@ extern crate alloc;
 
 pub mod element;
 pub mod layout;
+pub mod motion;
 pub mod render;
 pub mod run;
 pub mod text;