Replaces the full sentence ("Heck steht höher, links steht höher") in
the .small activity family with a compact "H ↑ L" style readout: a
direction letter per axis (only shown when outside tolerance) around a
single up arrow, since only the higher side is ever named anyway. Text
now shares the same green/orange/red scale as the bubble glyph (factored
into one levelColour helper instead of two duplicated thresholds), and
uses a scalable font style with minimumScaleFactor so it fits whatever
size CarPlay actually grants the card - there's no API to query the
physical display size from Live Activity content.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
