fix: react-doctor → 64/100 (Bugs 122, Perf 286, A11y 613, Maint 436)

- CartContext: lazy initializers replace mount-only useEffect
  hydration; remove 8 no-initialize-state warnings
- Toast/AdminSearchInput: React 19 useContext/use + drop
  forwardRef (3 no-react19-deprecated-apis)
- ProductFormModal: lazy initializers + useSyncExternalStore
  for mount; parent adds key=editingProduct.id
- InstallPrompt: useReducer for prompt state (no-cascading-set-state)
- QRScanModal: ref-based latest-callback pattern replaces
  useEffectEvent deps mistake
- OnboardingFlow: functional setState (rerender-functional-setstate)
- UsersPage/StopsCalendar/FeaturesAndStats: lazy initializers
  (rerender-lazy-state-init)
- FAQClientPage: server-side brand settings fetch via getBrandSettingsPublic
  in layout; remove supabase import
- LandingPageWrapper: href='#' → href='#top' (anchor-is-valid)
- TuxedoVideoHero: replace animate-bounce with ease-out-expo
  (no-inline-bounce-easing)
- ProductTableClient: useCallback for handleDeleted
  (jsx-no-new-function-as-prop)
- excel-parser: pre-compile delimiter regexes (js-hoist-regexp)
- water-log/settings: Promise.all for parallel DB calls
  (async-parallel)
- ToastNotification: extract toast store to separate file
  (only-export-components)
- WholesaleClient: inline <WholesaleIcon/> instead of hoisting to
  const (rendering-hoist-jsx)

src/app/tuxedo/page.tsx

@@ -693,7 +693,7 @@ export default function TuxedoPage() {
                 </div>
                 {showSchedulePdf && (
                   <FadeOnScroll from="right" delay={0.3}>
-                    <a
+                    <Link
                       href="/api/tuxedo/schedule-pdf"
                       download
                       className="shrink-0 hidden md:inline-flex items-center gap-2.5 rounded-2xl bg-stone-900 px-6 py-3.5 text-sm font-semibold text-white hover:bg-stone-800 active:bg-stone-950 transition-colors"
@@ -702,7 +702,7 @@ export default function TuxedoPage() {
                         <path strokeLinecap="round" strokeLinejoin="round" d="M12 10v6m0 0l-3-3m3 3l3-3m2 8H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z" />
                       </svg>
                       Download Schedule
-                    </a>
+                    </Link>
                   </FadeOnScroll>
                 )}
               </div>
@@ -726,13 +726,13 @@ export default function TuxedoPage() {
                         View All Stops
                       </Link>
                       {showSchedulePdf && (
-                        <a
+                        <Link
                           href="/api/tuxedo/schedule-pdf"
                           download
                           className="inline-flex items-center gap-2 rounded-2xl bg-white px-5 py-2.5 text-sm font-semibold text-stone-700 ring-1 ring-stone-200 hover:bg-stone-50 transition-colors"
                         >
                           Download Schedule
-                        </a>
+                        </Link>
                       )}
                     </div>
                   </div>