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/motion/transitions.ts

@@ -7,13 +7,6 @@ export const springTransition: Transition = {
   damping: 30,
 };
 
-// Smooth spring for larger movements
-export const smoothSpring: Transition = {
-  type: 'spring',
-  stiffness: 300,
-  damping: 25,
-};
-
 // Expo easing curve (Linear-style)
 export const easeOutExpo = [0.16, 1, 0.3, 1] as const;
 
@@ -42,27 +35,6 @@ export const slideUpTransition: Transition = {
   ease: easeOutExpo,
 };
 
-// Slide down animation (for dropdowns, popovers)
-export const slideDown: Variants = {
-  initial: { opacity: 0, y: -8 },
-  animate: { opacity: 1, y: 0 },
-  exit: { opacity: 0 },
-};
-
-// Slide from right (for sheets, sidebars)
-export const slideRight: Variants = {
-  initial: { opacity: 0, x: 20 },
-  animate: { opacity: 1, x: 0 },
-  exit: { opacity: 0, x: 20 },
-};
-
-// Slide from left
-export const slideLeft: Variants = {
-  initial: { opacity: 0, x: -20 },
-  animate: { opacity: 1, x: 0 },
-  exit: { opacity: 0, x: -20 },
-};
-
 // Scale animation (for modals, dialogs)
 export const scale: Variants = {
   initial: { opacity: 0, scale: 0.95 },
@@ -92,16 +64,6 @@ export const staggerContainer: Variants = {
   },
 };
 
-// Fast stagger for dense lists
-export const fastStaggerContainer: Variants = {
-  initial: {},
-  animate: {
-    transition: {
-      staggerChildren: 0.03,
-    },
-  },
-};
-
 // Stagger item (use with staggerContainer)
 // Exit is instant to avoid visual glitches in Telegram Mini App
 export const staggerItem: Variants = {