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/actions/admin/users.ts

@@ -2,6 +2,7 @@
 
 import "server-only";
 import { query, withTx } from "@/lib/db";
+import { serverWarn } from "@/lib/server-log";
 import {
   createUser as neonAuthCreateUser,
   requestPasswordReset as neonAuthRequestPasswordReset,
@@ -131,7 +132,7 @@ async function sendWelcomeEmailSafe(input: {
           brandName = settings.settings.brand_name ?? brandName;
         }
       } catch (brandErr) {
-        console.warn(
+        serverWarn(
           "[createAdminUser] Failed to load brand settings for welcome email:",
           brandErr,
         );
@@ -495,7 +496,7 @@ async function signupFallbackCreate(
     try {
       await query(`UPDATE neon_auth.user SET "emailVerified" = true WHERE id = $1`, [userId]);
     } catch (verifyErr) {
-      console.warn(
+      serverWarn(
         "[createAdminUser] Failed to set emailVerified=true (non-fatal):",
         verifyErr,
       );