Port the prototype massing.js to a client-only React component (MassingScene)
behind a dynamic(ssr:false) wrapper (MassingViewer), wired into the future3d +
insolation drawers, replacing the СКОРО SoonCards.
Generative mass from parcel area (real geometry_suitability.area_ha) × КСИТ-цель
3.5 (labelled regulation-default · НСПД — honest, real max_far not in /analyze),
OrbitControls (orbit/zoom/auto-rotate), time-of-day sun with shadows (insolation
preview), live GFA/КСИТ-факт metrics (green ≤3.5 / amber over). Full renderer/
scene/RAF dispose on drawer close; graceful WebGL-unavailable fallback.
Adds three@0.184.0 + @types/three (package.json + package-lock.json in sync).
SSR-isolated (three imported only in MassingScene). TS strict, no any.
Wire analysis/[cad]/page.tsx: replace SidebarPlaceholder with
AnalysisSidebar (sticky, IntersectionObserver scrollspy on sections
1/2/3/3.1/3.2/3.3/4/5), header with AnalysisBreadcrumb (SiteFinder
→ cad → Анализ) and UserAvatar (gd_org_id from localStorage, SSR-safe).
Add lucide-react to package.json (was used in A1 but missing from deps).
3 pages (market, PRINZIP drilldown, developers leaderboard) on top of
existing v_developer_full_metrics + domrf_realization views. ECharts on
the frontend, FastAPI router /api/v1/analytics on the backend.
