Introduces a new flat, chamfered label sized for Gridfinity storage box
lids, sharing the same Text/Symbol API as gridfinity-bin-label so both
labels draw from one icon catalogue. Symbol shapes, alignment math, and
text/symbol primitives now live in lib/label-decorations.scad and are
consumed by both labels via `use`. label_text gained \n-driven multi-line
support with a configurable line-spacing factor. STL/preview scripts
skip lib/ since it has no top-level geometry.
Felipe M.
e843c23de1