feat(ui): field-info tips and retire landscape gate

chore(render): retire MESH mode; bump to 1.6.0

feat(ui): widen Spacing to 2.0 and recenter Length track

feat(ui): English-only product copy and EN Compare vocab

feat(ui): defaults for ARITHMETIC + ANALYSIS + POINTS from capture

feat(ui): center Grosor Puntos default at 0.05

feat(ui): raise Amplitud Y max to 40

feat(ui): raise Amplitud Y max to 20 without changing default

feat(ui): dblclick spatial sliders to restore context defaults

feat(ui): finer Control Espacial 3D slider steps for gradual tuning

feat(ui): recenter Control Espacial 3D slider ranges on defaults