Before: moving a room in a 2D sketch meant rebuilding it in a separate 3D tool, and overlapping rooms were a conflict. Now: drag in the Simple 2D plan, the FULL 3D model follows live, the overlap turns into an Ensuite automatically, and the UI + 3D labels switch 中文 / EN / 日本語.
Real production site: layout-tweaks-dual.pages.dev · recorded with headless Chromium + real pointer drags · 28.1 s, 1920×1080 H.264.