feat(uat-batch-11): picker polish + BulkAddBerthsWizard currency + DocumentsHub root cleanup

- BulkAddBerthsWizard `priceCurrency` row + apply-to-all swapped from
  freetext Input to the shared CurrencySelect. Same idiom as
  berth-form + expense-form-dialog.
- /api/v1/yachts/autocomplete no longer short-circuits to `[]` when
  the search query is empty — the service returns the top 20
  most-recently-updated yachts so the picker has a useful default
  view the moment it opens. Saves the rep from a dead-end empty
  state.
- YachtPicker gains a fallback useQuery against `/api/v1/yachts/{id}`
  when the selected yacht isn't present in the current autocomplete
  window. Trigger label now shows the real name (was falling back to
  "Yacht <uuid-prefix>" when a parent pre-selected a value from a URL
  param).
- DocumentsHub: breadcrumb row only renders when a folder is
  selected. The "Home / All documents" placeholder was wasted
  vertical space above the PageHeader on the root view.

tsc clean. 1419/1419 vitest pass.

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

src/components/admin/bulk-add-berths-wizard.tsx

@@ -36,6 +36,7 @@ import {
 import { apiFetch } from '@/lib/api/client';
 import { toastError } from '@/lib/api/toast-error';
 import { useVocabulary } from '@/hooks/use-vocabulary';
+import { CurrencySelect } from '@/components/shared/currency-select';
 
 const DOCK_LETTERS = ['A', 'B', 'C', 'D', 'E'] as const;
 type DockLetter = (typeof DOCK_LETTERS)[number];
@@ -283,12 +284,10 @@ export function BulkAddBerthsWizard() {
                   />
                 </td>
                 <td className="py-1 pr-2">
-                  <Input
+                  <CurrencySelect
+                    value={undefined}
+                    onValueChange={(v) => applyToAll('priceCurrency', v)}
                     className="h-7 text-xs"
-                    onBlur={(e) => {
-                      if (e.target.value) applyToAll('priceCurrency', e.target.value.toUpperCase());
-                    }}
-                    placeholder="all"
                   />
                 </td>
                 <td />
@@ -351,12 +350,10 @@ export function BulkAddBerthsWizard() {
                     />
                   </td>
                   <td className="py-1 pr-2">
-                    <Input
-                      className="h-7 w-20 text-xs"
-                      value={row.priceCurrency}
-                      onChange={(e) =>
-                        setRowField(idx, 'priceCurrency', e.target.value.toUpperCase())
-                      }
+                    <CurrencySelect
+                      value={row.priceCurrency || undefined}
+                      onValueChange={(v) => setRowField(idx, 'priceCurrency', v)}
+                      className="h-7 w-24 text-xs"
                     />
                   </td>
                   <td className="py-1 pr-2">