refactor(clients): rebuild detail tabs + columns for new data model

- ClientData in client-detail.tsx now reflects the stripped shape from
  Task 8.2 (drop companyName/isProxy/proxy*/yacht*/berthSizeDesired) and
  gains yachts / companies / activeReservations arrays.
- client-tabs.tsx: Overview trimmed (personal, contacts, source, tags);
  three new count-badged tabs (Yachts, Companies, Reservations).
- New client-yachts-tab.tsx renders owned yachts + Add yacht CTA (TODO:
  YachtForm preset-owner wiring for v2).
- New client-companies-tab.tsx renders memberships with Primary badge and
  since-date; management still lives on the company detail page.
- New client-reservations-tab.tsx maps activeReservations into ReservationRow
  shape and delegates to <ReservationList showBerth />.
- client-columns.tsx drops companyName column (TODO: add Yachts count +
  Primary company once list endpoint joins those).
- client-filters.tsx drops isProxy filter.
- Wire realtime invalidations for yacht:ownership_transferred,
  company_membership:added/ended, and berth_reservation:*.

src/components/clients/client-columns.tsx

@@ -18,7 +18,7 @@ import { TagBadge } from '@/components/shared/tag-badge';
 export interface ClientRow {
   id: string;
   fullName: string;
-  companyName: string | null;
+  nationality: string | null;
   source: string | null;
   archivedAt: string | null;
   createdAt: string;
@@ -39,6 +39,10 @@ interface GetColumnsOptions {
   onArchive: (client: ClientRow) => void;
 }
 
+// TODO: Add "Yachts" (count) and "Primary company" columns once the
+// GET /api/v1/clients list endpoint joins owned-yachts and primary-company
+// data into the row shape. Until then, the columns are omitted rather than
+// shown as empty placeholders.
 export function getClientColumns({
   portSlug,
   onEdit,
@@ -59,14 +63,6 @@ export function getClientColumns({
         </Link>
       ),
     },
-    {
-      id: 'companyName',
-      accessorKey: 'companyName',
-      header: 'Company',
-      cell: ({ getValue }) => (
-        <span className="text-muted-foreground">{(getValue() as string | null) ?? '—'}</span>
-      ),
-    },
     {
       id: 'primaryContact',
       header: 'Primary Contact',
@@ -82,6 +78,14 @@ export function getClientColumns({
         );
       },
     },
+    {
+      id: 'nationality',
+      accessorKey: 'nationality',
+      header: 'Nationality',
+      cell: ({ getValue }) => (
+        <span className="text-muted-foreground">{(getValue() as string | null) ?? '—'}</span>
+      ),
+    },
     {
       id: 'source',
       accessorKey: 'source',
@@ -149,10 +153,7 @@ export function getClientColumns({
               <Pencil className="mr-2 h-3.5 w-3.5" />
               Edit
             </DropdownMenuItem>
-            <DropdownMenuItem
-              className="text-destructive"
-              onClick={() => onArchive(row.original)}
-            >
+            <DropdownMenuItem className="text-destructive" onClick={() => onArchive(row.original)}>
               <Archive className="mr-2 h-3.5 w-3.5" />
               Archive
             </DropdownMenuItem>