Phase 3a: shadcn init + Home/Case List view

Initialize shadcn/ui (radix-nova preset) and wire its semantic tokens
to the editorial navy/cream/gold palette so primitives inherit the
judicial voice without per-component overrides.

Replace the Phase 2 live-probe with a real dashboard: KPI tiles,
conic-gradient status donut (ported from the vanilla renderHero),
and a TanStack Table cases list with search + sort. Add useCase(n)
hook with 5s staleTime/refetchInterval to replace the old manual
polling loop when Case Detail ships next.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

web-ui/package.json

@@ -13,12 +13,18 @@
     "@hookform/resolvers": "^5.2.2",
     "@tanstack/react-query": "^5.97.0",
     "@tanstack/react-table": "^8.21.3",
+    "class-variance-authority": "^0.7.1",
+    "clsx": "^2.1.1",
     "lucide-react": "^1.8.0",
     "next": "16.2.3",
+    "radix-ui": "^1.4.3",
     "react": "19.2.4",
     "react-dom": "19.2.4",
     "react-dropzone": "^15.0.0",
     "react-hook-form": "^7.72.1",
+    "shadcn": "^4.2.0",
+    "tailwind-merge": "^3.5.0",
+    "tw-animate-css": "^1.4.0",
     "zod": "^4.3.6"
   },
   "devDependencies": {