Pi's onboard chromium is 72 (Jan 2019). Two issues:
1. Python 3.5's mimetypes doesn't know woff/woff2/ttf, so Tornado
serves them as application/octet-stream which chromium 72 refuses
to use as web fonts -> all FA6 icons render as empty boxes. Add
scripts/deploy/patch_font_mime.py that monkey-patches bbctrl
Web.py's StaticFileHandler with correct content types. Run
automatically by deploy-hardware.sh (idempotent).
2. flex-gap landed in chromium 84. Add '> * + *' margin fallbacks
for the flex containers that show up on Program tab (action-bar,
action-btn, file-bar, file-btn) and tighten the kiosk-mode
settings rail so all 14 items fit in 768px height.
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