Lets the cross-section plane sweep back and forth between two positions
like a CT scan, so registration drift between passes shows up as the
section moves through the cloud instead of needing manual dragging.
Orphan branch with no history — includes the Tauri shell (src-tauri/) and
vendored Three.js (vendor/) that were never pushed before, so a fresh clone
can actually build the native app. Drops the large .pcd sample captures and
editor cruft (.obsidian, .DS_Store); they aren't needed to build or run the
app (point clouds load via drag-and-drop, not bundling).
Dongubak