Adds «6.4 Рекомендация по продукту» to Section6Forecast — the §13.4
product recommendation (class, unit-mix, commercial, USP, §16 reasons)
that previously existed only in the export renderers. Unit-mix is shown
as token-colored horizontal bars; since the assembler emits no per-format
share (pct), bars are honestly labeled as a deficit-by-format signal, not
a build-share. Graceful on thin/202-pending/partial reports.
- types/forecast.ts: ReportProductTz + nested interfaces, optional on ForecastReport
- ForecastProductTzBlock.tsx: per-field guards, role=img bars, reasons disclosure
- forecast-helpers.ts: deficitBarWidthPct
- Section6Forecast + sidebar nav: wire 6.4
Part of #958.
Segmented control «Горизонт прогноза» driving the analyze query (?horizon=)
and Section 6's target highlight. Default 12.
- HorizonSelector: radiogroup + a11y radios, tokens-only, tabular-nums,
disabled while a re-analyze is in flight
- useParcelAnalyzeQuery(cad, horizon=12): horizon in queryKey + ?horizon=;
keepPreviousData so switching horizon doesn't blank the page to loading
- AnalysisPageContent: horizon state + forecast-poll invalidation on change
- Section6Forecast/ForecastHorizonsBlock: selectedHorizon → target row («Целевой»)
Part of EPIC #958.
