Market scan state was still tracked as separate nullable payload and status strings. This moves the hook internals to RemoteData<MarketScan> so loading and error paths can preserve previous data while keeping the existing marketScan and marketStatus return values for current card consumers.
Constraint: Preserve the existing useCityMarketScan public compatibility fields.
Rejected: Update all card UI to consume marketRemote immediately | keeping the compatibility bridge avoids a broad rendering diff while the request state model lands.
Confidence: high
Scope-risk: narrow
Reversibility: clean
Tested: npm run build
Not-tested: Forced live market-scan failure with stale previous quote.
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