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.
Honey
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