Task: Render currency's monetary_nature and market_tier combos as badges

Currency's monetary_nature and market_tier combos currently show plain text (via the populateDynamicCombo<Entity> mechanism landed in task 318EE3EB). Render them as colored badges instead, matching Book's book_status field (setup_badge_combo=/=BadgeCache, see clever_dijkstra worktree's book-status work if not yet merged into main).

book_status is a static_combo field with a fixed value set and a badge_key property — BadgeCache presumably keys off a small, known enum. monetary_nature=/=market_tier are dynamic, server-fetched reference-table combos (populateDynamicCombo<Entity>, not static_combo), so the existing badge mechanism doesn't apply as-is. This task needs to either:

• extend the badge mechanism to work with dynamically-fetched combo items (badge color keyed off each item's code, not a static enum), or
• find that the fetched reference-table rows already carry a badge color mapping the server can express, or
• conclude it's not a good fit and document why.

• monetary_nature and market_tier combos render colored badges matching book_status's visual pattern, OR a documented reason they can't/shouldn't (e.g. mechanism mismatch, no natural badge color source) with the decision recorded here.
• Build passes.

(Implementation strategy. Written when work starts; key decisions are distilled into the parent story's * Decisions at close, but the plan itself stays — it is the historical record of what we did.)

Done, but never marked as such. badge_key/is_badge are set for both monetary_nature and market_tier, in both the detail-dialog combos and the list-window columns (currency.org's * Detail fields and