- Controller: @archived_goals exposes state=archived rows already pulled
by the all_goals load. No extra query (sliced from the existing array).
- Index template: <details> disclosure under "Completed" so archived
goals are reachable from the list without cluttering the active /
completed sections. Collapsed by default.
- GoalCardComponent: uses display_status for the data attribute (so the
card on the index reads as Archived instead of Behind), opacity-75
applies to archived too, footer_line short-circuits to "Archived" and
pace_line returns nil. Matches the show-page archived semantics
shipped earlier.
- Locale: new savings_goals.index.archived_section.heading and
savings_goals.goal_card.footer_archived.