Enable alpha blending on the controls texture so sprite icons
float on any background without white cell artifacts. Regenerate
skin template with transparent cells and magenta gutters. Change
focus highlight from blue to red.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Add tools/gen_skin_template.py to generate a labeled 642x420 PNG template
for creating custom spritesheets. Move rg35xx device scripts from tools/
to device/rg35xx/. Point prev_sprite at its own cell (bottom-center) so
Prev and Next can have distinct icons.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
