v0.1.2

Fixed

• Position FLIP is now gated by the element's position relative to its
  immediate parent, not its body-relative offset. Previously, any layout
  change that shrank content above a tracked list — a delete in one
  demo, for instance — would shift everything below it in body
  coordinates, and Shift would FLIP every unrelated element down the
  page back to its old absolute position. Now only elements whose
  position within their own parent changes get animated; the body-
  relative delta is still what the FLIP translates by, so bottom-
  anchored layouts (toast stacks) keep working.
• Cached layouts now refresh on window resize. The MutationObserver
  doesn't fire on a resize, so previously every tracked element's
  __shiftLayout went stale and the next real layout change would FLIP
  against the pre-resize positions — animating the resize delta into
  whatever change came next. A debounced resize listener now remeasures
  every tracked element so the next FLIP starts from the current layout.