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/shared/settings-form-card.tsx

@@ -147,7 +147,7 @@ export function SettingsFormCard({ title, description, fields, extra }: Settings
         </CardHeader>
         <CardContent>
           <div className="flex items-center text-sm text-muted-foreground">
-            <Loader2 className="mr-2 h-4 w-4 animate-spin" />
+            <Loader2 className="mr-2 h-4 w-4 animate-spin" aria-hidden />
             Loading…
           </div>
         </CardContent>
@@ -176,7 +176,7 @@ export function SettingsFormCard({ title, description, fields, extra }: Settings
         <div className="flex items-center justify-end gap-2 pt-2 border-t">
           {extra}
           <Button onClick={handleSave} disabled={saving || !dirty}>
-            {saving && <Loader2 className="mr-2 h-4 w-4 animate-spin" />}
+            {saving && <Loader2 className="mr-2 h-4 w-4 animate-spin" aria-hidden />}
             Save changes
           </Button>
         </div>