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/admin/AdminSidebar.tsx

@@ -1,6 +1,6 @@
 "use client";
 
-import { useState, useEffect, useRef, useCallback, useMemo, KeyboardEvent, ComponentType } from "react";
+import { useState, useEffect, useEffectEvent, useRef, useCallback, useMemo, KeyboardEvent, ComponentType } from "react";
 import Link from "next/link";
 import { usePathname, useRouter } from "next/navigation";
 import {
@@ -212,15 +212,20 @@ export default function AdminSidebar({
   }, []);
 
   // Handle escape key
+  // useEffectEvent so we always see the latest closeMobileMenu without
+  // re-subscribing the keydown handler on every parent render.
+  const onEscapeEffect = useEffectEvent(() => {
+    closeMobileMenu();
+  });
   useEffect(() => {
     const handleEscape = (e: globalThis.KeyboardEvent) => {
       if (e.key === "Escape" && mobileOpen) {
-        closeMobileMenu();
+        onEscapeEffect();
       }
     };
     document.addEventListener("keydown", handleEscape);
     return () => document.removeEventListener("keydown", handleEscape);
-  }, [mobileOpen, closeMobileMenu]);
+  }, [mobileOpen]);
 
   // Focus trap and body scroll lock
   useEffect(() => {