Tail of the redundancy + clarity pass:
- Goal card on the index drops ".00" cents from every Money.format
call (now `format(precision: 0)`). The card uses the same
visual rhythm as the show page; cents add zero info at this
scale.
- Card's "behind"-status footer now reads "Save $X/mo to catch
up" with X = `catch_up_delta_money` (the delta the user must
add), not the full `monthly_target_amount` (which read as a
total monthly burn). Same fix as the show-page banner.
- Pending-pledge banner title becomes pluralized: drops "0 days
left" / "1 days left" grammatical bugs. New locale tree:
title.zero → "Pending: $X into Y · expires today"
title.one → "Pending: $X into Y · 1 day left"
title.other → "Pending: $X into Y · N days left"
Also drops the "Watching for" phrasing (system-talk) for
"Pending:" (state-talk) and drops cents from the amount.
- `confirm_cancel_body` likewise renders amount without cents.
Cards and banner now read consistently with the show page; one
voice across the surfaces.
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