The single-glyph 一/三/五 and M/W/F read as cryptic initials; the gutter
now carries the full names 星期一/星期三/星期五 and Mon/Wed/Fri. The
weekday gutter drops its 10px single-glyph width and self-sizes to its
widest label (the locales differ), with nowrap keeping a full name on
one line.