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/settings/settings-manager.tsx

@@ -408,7 +408,7 @@ export function SettingsManager() {
                           saveSetting(setting.key, values[setting.key] ?? setting.defaultValue)
                         }
                       >
-                        <Save className="h-3.5 w-3.5" />
+                        <Save className="h-3.5 w-3.5" aria-hidden />
                       </Button>
                     </div>
                   </div>
@@ -454,7 +454,7 @@ export function SettingsManager() {
                       saveSetting(setting.key, values[setting.key] ?? setting.defaultValue)
                     }
                   >
-                    <Save className="h-3.5 w-3.5" />
+                    <Save className="h-3.5 w-3.5" aria-hidden />
                   </Button>
                 </div>
               </div>
@@ -542,7 +542,7 @@ export function SettingsManager() {
                       size="sm"
                       className="text-destructive hover:text-destructive"
                     >
-                      <Trash2 className="h-4 w-4" />
+                      <Trash2 className="h-4 w-4" aria-hidden />
                     </Button>
                   }
                   title="Delete Setting"
@@ -569,7 +569,7 @@ export function SettingsManager() {
                 className="flex-1"
               />
               <Button variant="outline" onClick={handleAddCustom} disabled={!customKey.trim()}>
-                <Plus className="mr-1 h-4 w-4" />
+                <Plus className="mr-1 h-4 w-4" aria-hidden />
                 Add
               </Button>
             </div>