add understory_taffy adapter crate for Taffy ↔ box tree integration
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- Introduce a new `understory_taffy` crate to bridge Taffy’s high-level `TaffyTree` API with `understory_box_tree::Tree`, wiring Taffy’s layout results into `LocalNode::local_bounds`. - Provide `TaffyBoxMap` as a non-owning adapter that maintains a mapping from `taffy::NodeId` to `understory_box_tree::NodeId` and exposes `sync_layout` / `sync_layout_and_commit` for any `Tree<B>` backend, plus a `TaffyBoxTree` convenience wrapper that owns a box tree and embeds a `TaffyBoxMap`.
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- Change `sync_layout` to treat Taffy positions as parent-relative transforms and write size-only `local_bounds`, so box-tree transforms are cumulative and nested layout is correct. - Introduce `sync_layout_with` to let callers run custom logic (e.g. visual transform computation) between Taffy layout and box-tree updates. - Add `layout_size_rect` helper and wire up `Affine::translate` for the default mapping.
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understory_taffycrate to bridge Taffy’s high-levelTaffyTreeAPI withunderstory_box_tree::Tree, wiring Taffy’s layout results intoLocalNode::local_bounds.TaffyBoxMapas a non-owning adapter that maintains a mapping fromtaffy::NodeIdtounderstory_box_tree::NodeIdand exposessync_layout/sync_layout_and_commitfor anyTree<B>backend, plus aTaffyBoxTreeconvenience wrapper that owns a box tree and embeds aTaffyBoxMap.