Puffer Card v1.3.0

Added

• Fourth optional sensor position (extra), sitting between middle and
  bottom. Fully backward compatible: existing configs with only
  top/middle/bottom render pixel-identical to before — the extra
  slot is simply left unconfigured. With all four positions set, the tank
  (normal layout) grows taller and badge text shrinks slightly so nothing
  overlaps; both layouts get slightly smaller fonts in this case.
• Side pipes in the normal layout now follow the number of configured
  sensors (1 to 4), each centered on its sensor's height, instead of a
  fixed pair of decorative pipes.
• A 4th fixed chart color (teal) so a 4-sensor history chart never repeats
  a color between series.
• dist/translations/index.json, a manifest listing the languages shipped
  with the card, plus scripts/check-translations.js to validate that
  every language file has the same keys as the English reference —
  wired into the Validate HACS CI workflow. Documented in the README
  under "Languages" as the path for contributing a new translation
  (no code changes required).