refactor: full codebase cleanup, dependency updates, and lint fixes

Phase 0: Remove ~920 lines of dead code (ThemeBentoPicker, PromoDiscountBadge,
AdminLayout, SettingsSidebar, MovingGradient, EmptyState, miniapp API, unused
types/functions/transitions/skeleton helpers). Fix API barrel file (add 20 missing exports).

Phase 1: Add ErrorBoundary (app/page/widget levels), centralize constants,
add axios timeout, fix staleTime:0 in React Query.

Phase 2: Consolidate hexToHsl, extract email validation, fix duplicate code.

Phase 3: Fix auth race condition (await checkAdminStatus), memoize useCurrency,
add WebSocket message validation.

Phase 4: Extract useBranding, useFeatureFlags, useScrollRestoration from AppShell.

Phase 5: Remove all eslint-disable react-hooks/exhaustive-deps (14 total),
simplify logger, remove deprecated hooks (useBackButton, useTelegramDnd,
useTelegramWebApp).

Dependencies: React 19, react-router 7, zustand 5, i18next 25, react-i18next 16,
eslint-plugin-react-refresh 0.5. Remove unused @lottiefiles/dotlottie-react.
Convert vite manualChunks to function-based approach for react-router v7 compat.

Lint: Fix logger.ts no-unused-expressions, fix react-refresh/only-export-components
in 6 Radix primitive files (const re-exports → direct re-exports), fix
WebSocketProvider exhaustive-deps. Result: 0 errors, 0 warnings.

Add CLAUDE.md to .gitignore.

src/components/primitives/Select/Select.tsx

@@ -5,6 +5,8 @@ import { cn } from '@/lib/utils';
 import { usePlatform } from '@/platform';
 import { dropdown, dropdownTransition } from '../../motion/transitions';
 
+export { Root as Select, Group as SelectGroup } from '@radix-ui/react-select';
+
 // Icons
 const ChevronDownIcon = () => (
   <svg width="16" height="16" viewBox="0 0 16 16" fill="none" className="text-dark-400">
@@ -30,9 +32,6 @@ const CheckIcon = () => (
   </svg>
 );
 
-// Root
-export const Select = SelectPrimitive.Root;
-
 // Trigger
 export interface SelectTriggerProps extends ComponentPropsWithoutRef<
   typeof SelectPrimitive.Trigger
@@ -149,9 +148,6 @@ export const SelectItem = forwardRef<HTMLDivElement, SelectItemProps>(
 
 SelectItem.displayName = 'SelectItem';
 
-// Group
-export const SelectGroup = SelectPrimitive.Group;
-
 // Label
 export type SelectLabelProps = ComponentPropsWithoutRef<typeof SelectPrimitive.Label>;