refactor(costs): extract localized cost text presentation (#459)

Move cost snapshots, period labels, qualified values, counts, totals and legacy dashboard wording to an explicit-format QML owner. Preserve root interfaces, range/privacy ownership and existing fallbacks. Update executed component/catalog fixtures and development ownership documentation; no user-visible behavior or parity change.
614b49a5d2Simone committed on 10/7/2026, 11:55:48 PM· committed by GitHubparentb5ae49f
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