fix: full X→Y→Z scan GIFs

fix: PIL boot seeds + image min-height so plots paint

fix: CSS grid 2x2 in-tree + numpy boot images

fix: reparent 2x2 viewports to body — all four cells

fix: fixed 2x2 viewports for 1920x1080

fix: flat 2x2 viewports + boot PNG seed images

fix: seed 4 viewports at startup + equal 2-row plot layout

fix: control column layout match desired (horizontal chips, Play+Build)