Vendor Font Awesome Free Solid (fonts/fa-solid-900.ttf, SIL OFL
licensed -- see fonts/FONT-AWESOME-LICENSE.txt) for its actual
train/bus glyphs. Confirmed live these stay sharp and recognizable
even at the tiny size the detail line renders at (~20px), unlike a
hand-drawn shape would be, and unlike emoji (not in DejaVu Sans,
would've rendered as tofu).
render_utils.py gets a load_icon_font() alongside the existing
load_font(), plus named ICON_BUS/ICON_TRAIN codepoint constants so
screens don't need to embed raw Private-Use-Area unicode literals.
New screen alongside clock/weather/navidrome. Upload goes through the web
UI (validated with PIL before accepting, stored under web/static/uploads/,
gitignored), or point it at a URL re-fetched every 30 minutes. Cover/contain
fit modes (new fit_cover/fit_contain helpers in render_utils.py, generalized
from the square-only cover-art cropping already used by the Navidrome
screen), plus the same contrast-boost/grayscale options that screen has.