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/components/wholesale/admin/ProductsTab.tsx

@@ -221,7 +221,7 @@ export default function ProductsTab({ products, brandId, onMsg, onRefresh }: Pro
                 <td className="px-5 py-4 product-actions-cell relative">
                   <div className="flex items-center gap-1.5">
                     <div className="relative">
-                      <button
+                      <button type="button"
                         onClick={(e) => toggleProductActions(p.id, e)}
                         title="More actions"
                         className="inline-flex items-center justify-center rounded-xl w-9 h-9 text-[var(--admin-text-muted)] hover:text-[var(--admin-text-secondary)] hover:bg-[var(--admin-bg-subtle)] transition-colors"
@@ -233,7 +233,7 @@ export default function ProductsTab({ products, brandId, onMsg, onRefresh }: Pro
                           className="absolute bottom-full right-0 mb-1 z-30 w-48 rounded-xl bg-white shadow-xl ring-1 ring-[var(--admin-border)] py-1 text-sm"
                           onClick={e => e.stopPropagation()}
                         >
-                          <button
+                          <button type="button"
                             onClick={() => { setOpenProductActions(null); openEdit(p); }}
                             className="w-full text-left px-4 py-3 text-[var(--admin-accent)] hover:bg-[var(--admin-accent-light)] flex items-center gap-3 font-medium"
                           >
@@ -241,7 +241,7 @@ export default function ProductsTab({ products, brandId, onMsg, onRefresh }: Pro
                             Edit Product
                           </button>
                           <div className="my-1 border-t border-[var(--admin-border)]" />
-                          <button
+                          <button type="button"
                             onClick={() => { setOpenProductActions(null); handleDeleteProduct(p.id); }}
                             disabled={deletingProduct === p.id}
                             className="w-full text-left px-4 py-3 text-[var(--admin-danger)] hover:bg-[var(--admin-danger-light)] flex items-center gap-3 disabled:opacity-50"