Pushover renders the notification body in a proportional font, so the
space-padded label/value columns never lined up on a phone — the body
collapsed into a ragged flat list with no visual grouping. The html
variant was worse: the padding sat inside the HTML, so it collapsed to a
single space.
Counters are now grouped two per line and joined with a middle dot, which
survives any font. The body drops from 8 lines to 5 and no longer restates
the outcome the title already carries.
- replace _notify_row/LABEL_WIDTH/VALUE_WIDTH with _stat_row
- add docs/notify-preview.py, which renders the real build_summary()
output as a phone-width PNG so layout changes can be reviewed visually
- tests: assert no space padding, two counters per row, and that the body
does not repeat the title
