fix(audit-wave-10): aria-hidden sweep on decorative Lucide icons (#69)

Mechanical codemod added \`aria-hidden\` to 444 self-closing single-line
Lucide icon JSX elements across 267 .tsx files in:

- shared/, layout/, dashboard/
- admin/ (all sections)
- clients/, berths/, yachts/, companies/, interests/, documents/
- reminders/, reservations/, residential/, expenses/, email/

The regex targeted only the safe pattern \`<IconName className="..." />\`
(no other props, self-closing, capitalized component name). Every match
inspected is a decorative companion to visible text or sits inside a
button whose accessible name comes from \`aria-label\` / sr-only text
— the icon itself should not be announced.

Screen readers no longer double-read the icon + the adjacent label
text (e.g. "Pencil Pencil Edit" → just "Edit"). The existing
@axe-core/playwright smoke test (\`20-accessibility.spec.ts\`) continues
to pass.

Test suite stays at 1315/1315 vitest. typescript clean.

Closes task #69 (aria-hidden sweep) from the AUDIT-2026-05-12 follow-ups
backlog.

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

src/components/admin/custom-fields/custom-fields-manager.tsx

@@ -124,7 +124,7 @@ export function CustomFieldsManager() {
       cell: ({ row }) => (
         <div className="flex items-center justify-end gap-1">
           <Button variant="ghost" size="sm" onClick={() => handleEdit(row.original)}>
-            <Pencil className="h-4 w-4" />
+            <Pencil className="h-4 w-4" aria-hidden />
             <span className="sr-only">Edit</span>
           </Button>
           <ConfirmationDialog
@@ -135,7 +135,7 @@ export function CustomFieldsManager() {
                 className="text-destructive hover:text-destructive"
                 disabled={deletingId === row.original.id}
               >
-                <Trash2 className="h-4 w-4" />
+                <Trash2 className="h-4 w-4" aria-hidden />
                 <span className="sr-only">Delete</span>
               </Button>
             }
@@ -159,7 +159,7 @@ export function CustomFieldsManager() {
         description="Define custom fields for clients and records"
         actions={
           <Button onClick={handleCreate}>
-            <Plus className="mr-1.5 h-4 w-4" />
+            <Plus className="mr-1.5 h-4 w-4" aria-hidden />
             New Field
           </Button>
         }
@@ -228,7 +228,7 @@ export function CustomFieldsManager() {
                         onClick={() => handleEdit(original)}
                         aria-label="Edit field"
                       >
-                        <Pencil className="h-4 w-4" />
+                        <Pencil className="h-4 w-4" aria-hidden />
                       </Button>
                       <ConfirmationDialog
                         trigger={
@@ -239,7 +239,7 @@ export function CustomFieldsManager() {
                             disabled={deletingId === original.id}
                             aria-label="Delete field"
                           >
-                            <Trash2 className="h-4 w-4" />
+                            <Trash2 className="h-4 w-4" aria-hidden />
                           </Button>
                         }
                         title="Delete Custom Field"