Phase 4.5: practice area integration in the Next.js UI

Backend commit 26d09d6 introduced a multi-tenant axis (practice_area +
appeal_subtype) that the vanilla UI picked up but the new Next.js
rewrite did not. Close the gap in the screens we already shipped so
future search/filter work in Phase 5 has the right data on screen.

- lib/practice-area.ts — new: enum + label maps + deriveSubtype(),
  mirrors mcp-server/src/legal_mcp/services/practice_area.py.
- lib/schemas/case.ts — two new z.enum fields on caseCreateSchema.
- lib/api/cases.ts — Case / CaseDetail gain practice_area and
  appeal_subtype as optional (cached pre-migration responses still
  parse cleanly).
- wizard/case-wizard.tsx — basics step gains a practice_area dropdown
  (future domains disabled with "(בקרוב)") and an appeal_subtype
  dropdown with auto-fill effect tracking a userTouchedSubtype ref,
  same behaviour as wireSubtypeAutofill() in the vanilla UI.
- cases/case-header.tsx — gold badge next to the status shows
  "ועדת ערר · רישוי ובנייה" when both fields are populated.
- cases/cases-table.tsx — new "תחום" column showing subtype label
  (dash for unknown). No filter yet — that's phase 5 when a second
  domain actually exists.

Plan: ~/.claude/plans/woolly-cooking-graham.md

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

web-ui/src/components/cases/cases-table.tsx

@@ -17,6 +17,7 @@ import {
 import { Input } from "@/components/ui/input";
 import { Skeleton } from "@/components/ui/skeleton";
 import { StatusBadge } from "@/components/cases/status-badge";
+import { APPEAL_SUBTYPE_LABELS } from "@/lib/practice-area";
 import type { Case } from "@/lib/api/cases";
 
 function formatDate(iso?: string) {
@@ -59,6 +60,15 @@ const columns: ColumnDef<Case>[] = [
     header: "סטטוס",
     cell: ({ row }) => <StatusBadge status={row.original.status} />,
   },
+  {
+    accessorKey: "appeal_subtype",
+    header: "תחום",
+    cell: ({ row }) => {
+      const s = row.original.appeal_subtype;
+      if (!s || s === "unknown") return <span className="text-ink-muted">—</span>;
+      return <span className="text-ink-soft text-sm">{APPEAL_SUBTYPE_LABELS[s]}</span>;
+    },
+  },
   {
     accessorKey: "document_count",
     header: "מסמכים",