feat(ui): add owner-picker and yacht-picker components

Task 5.1 of the data-model refactor. Adds:
- OwnerPicker: polymorphic combobox that toggles between client and
  company autocomplete via a type switch inside the popover. Uses
  /api/v1/clients/options (search=) and /api/v1/companies/autocomplete
  (q=).
- YachtPicker: yacht autocomplete against /api/v1/yachts/autocomplete
  with optional ownerFilter prop to scope to a given client/company.

Both components use TanStack Query with debounced (300ms) input via the
existing use-debounce hook, and apiFetch which attaches X-Port-Id.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/components/shared/owner-picker.tsx

@@ -0,0 +1,164 @@
+'use client';
+
+import { useEffect, useState } from 'react';
+import { Check, ChevronsUpDown } from 'lucide-react';
+import { useQuery } from '@tanstack/react-query';
+
+import { Button } from '@/components/ui/button';
+import {
+  Command,
+  CommandEmpty,
+  CommandGroup,
+  CommandInput,
+  CommandItem,
+  CommandList,
+} from '@/components/ui/command';
+import { Popover, PopoverContent, PopoverTrigger } from '@/components/ui/popover';
+import { useDebounce } from '@/hooks/use-debounce';
+import { apiFetch } from '@/lib/api/client';
+import { cn } from '@/lib/utils';
+
+export type OwnerRef = { type: 'client' | 'company'; id: string };
+
+interface OwnerOption {
+  id: string;
+  name?: string | null;
+  fullName?: string | null;
+}
+
+interface OwnerPickerProps {
+  value: OwnerRef | null;
+  onChange: (value: OwnerRef | null) => void;
+  /** Optional placeholder when empty */
+  placeholder?: string;
+  /** Disable the component */
+  disabled?: boolean;
+}
+
+export function OwnerPicker({
+  value,
+  onChange,
+  placeholder = 'Select owner...',
+  disabled,
+}: OwnerPickerProps) {
+  const [open, setOpen] = useState(false);
+  const [type, setType] = useState<'client' | 'company'>(value?.type ?? 'client');
+  const [search, setSearch] = useState('');
+  const debounced = useDebounce(search, 300);
+
+  // Keep local `type` in sync if value.type changes externally.
+  useEffect(() => {
+    if (value?.type) setType(value.type);
+  }, [value?.type]);
+
+  const endpoint =
+    type === 'client'
+      ? `/api/v1/clients/options?search=${encodeURIComponent(debounced)}`
+      : `/api/v1/companies/autocomplete?q=${encodeURIComponent(debounced)}`;
+
+  const { data } = useQuery<{ data: OwnerOption[] }>({
+    queryKey: ['owner-picker', type, debounced],
+    queryFn: () => apiFetch(endpoint),
+    enabled: open,
+  });
+
+  const options = data?.data ?? [];
+
+  // Selected display label — show entity's name from current options if
+  // available, otherwise a truncated id fallback.
+  const selectedLabel = (() => {
+    if (!value) return placeholder;
+    const match = options.find((o) => o.id === value.id);
+    if (match) {
+      return type === 'client'
+        ? (match.fullName ?? '(unnamed client)')
+        : (match.name ?? '(unnamed company)');
+    }
+    return value.type === 'client'
+      ? `Client ${value.id.slice(0, 8)}`
+      : `Company ${value.id.slice(0, 8)}`;
+  })();
+
+  return (
+    <Popover open={open} onOpenChange={setOpen}>
+      <PopoverTrigger asChild>
+        <Button
+          variant="outline"
+          role="combobox"
+          disabled={disabled}
+          className={cn('w-full justify-between', !value && 'text-muted-foreground')}
+        >
+          <span className="truncate">
+            {value && (
+              <span className="mr-2 text-xs opacity-60">
+                {value.type === 'client' ? 'Client:' : 'Company:'}
+              </span>
+            )}
+            {selectedLabel}
+          </span>
+          <ChevronsUpDown className="ml-2 h-4 w-4 shrink-0 opacity-50" />
+        </Button>
+      </PopoverTrigger>
+      <PopoverContent className="w-[320px] p-0" align="start">
+        {/* Type toggle */}
+        <div className="flex border-b">
+          <button
+            type="button"
+            onClick={() => {
+              setType('client');
+              setSearch('');
+            }}
+            className={cn(
+              'flex-1 px-3 py-2 text-xs',
+              type === 'client' ? 'bg-accent font-medium' : 'hover:bg-accent/50',
+            )}
+          >
+            Client
+          </button>
+          <button
+            type="button"
+            onClick={() => {
+              setType('company');
+              setSearch('');
+            }}
+            className={cn(
+              'flex-1 px-3 py-2 text-xs',
+              type === 'company' ? 'bg-accent font-medium' : 'hover:bg-accent/50',
+            )}
+          >
+            Company
+          </button>
+        </div>
+
+        <Command shouldFilter={false}>
+          <CommandInput placeholder={`Search ${type}s…`} value={search} onValueChange={setSearch} />
+          <CommandList>
+            <CommandEmpty>No results.</CommandEmpty>
+            <CommandGroup>
+              {options.map((opt) => {
+                const label =
+                  type === 'client' ? (opt.fullName ?? '(unnamed)') : (opt.name ?? '(unnamed)');
+                const isSelected = value?.id === opt.id && value?.type === type;
+                return (
+                  <CommandItem
+                    key={opt.id}
+                    value={opt.id}
+                    onSelect={() => {
+                      onChange({ type, id: opt.id });
+                      setOpen(false);
+                    }}
+                  >
+                    <Check
+                      className={cn('mr-2 h-4 w-4', isSelected ? 'opacity-100' : 'opacity-0')}
+                    />
+                    {label}
+                  </CommandItem>
+                );
+              })}
+            </CommandGroup>
+          </CommandList>
+        </Command>
+      </PopoverContent>
+    </Popover>
+  );
+}