Preview scenes now take paint from the promoted document but GEOMETRY
from the unpromoted layout tree via the design canvas's exact layout
pass — honoring preserve_authored_geometry for Figma imports — so
preview positions match design mode by construction (was: full taffy
re-solve, elements shifted 100+ px on preserve docs, 2 px per promoted
hug widget). Hit-testing maps taps through the deepest painted node's
scene/runtime rect pair with a per-gesture anchor (pointer capture),
so drags never remap through neighbours mid-gesture. Input dispatch
split to preview/input.rs for the 800-line cap.
Pairs with the following device-frame commit (preview/mod.rs already
declares the present module it introduces).
Plan 2 of the web embedding SDK: a self-contained, framework-agnostic
TypeScript core wrapping the Plan-1 wasm Viewer. createViewer -> OpViewer with
load, read-only snapshots (document/pages/pageCount/activePage), pan/zoom
navigation (+ wheel), SVG export, load/viewportchange events, and destroy.
Read-only: no .op editing/mutation. Self-contained: zero @zseven-w/pen-* deps
(types vendored from jian-ops-schema ts-rs), tsup build, vitest+jsdom tests
that mock the wasm seam. 10/10 tests; tsc clean; post-destroy use-after-free
guarded. React+Vue adapters follow in Plan 3.
