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/utils/logger.ts

@@ -1,57 +1,46 @@
 /**
  * Утилита для логирования только в development режиме
- * В production логи не выводятся
+ * В production логи не выводятся (кроме error)
  */
 
 const isDev = import.meta.env.DEV;
 
-export const logger = {
-  log: (...args: unknown[]): void => {
+type LogLevel = 'log' | 'warn' | 'debug';
+
+function devOnly(level: LogLevel, prefix?: string) {
+  return (...args: unknown[]): void => {
     if (isDev) {
-      console.log(...args);
-    }
-  },
-
-  warn: (...args: unknown[]): void => {
-    if (isDev) {
-      console.warn(...args);
-    }
-  },
-
-  error: (...args: unknown[]): void => {
-    // Ошибки логируем всегда (важно для отладки в production)
-    console.error(...args);
-  },
-
-  debug: (...args: unknown[]): void => {
-    if (isDev) {
-      console.debug(...args);
-    }
-  },
-
-  /**
-   * Создаёт логгер с префиксом для конкретного модуля
-   */
-  createLogger: (prefix: string) => ({
-    log: (...args: unknown[]): void => {
-      if (isDev) {
-        console.log(`[${prefix}]`, ...args);
+      if (prefix) {
+        console[level](`[${prefix}]`, ...args);
+      } else {
+        console[level](...args);
       }
-    },
-    warn: (...args: unknown[]): void => {
-      if (isDev) {
-        console.warn(`[${prefix}]`, ...args);
-      }
-    },
-    error: (...args: unknown[]): void => {
+    }
+  };
+}
+
+function errorLog(prefix?: string) {
+  return (...args: unknown[]): void => {
+    if (prefix) {
       console.error(`[${prefix}]`, ...args);
-    },
-    debug: (...args: unknown[]): void => {
-      if (isDev) {
-        console.debug(`[${prefix}]`, ...args);
-      }
-    },
-  }),
+    } else {
+      console.error(...args);
+    }
+  };
+}
+
+function createLoggerInstance(prefix?: string) {
+  return {
+    log: devOnly('log', prefix),
+    warn: devOnly('warn', prefix),
+    error: errorLog(prefix),
+    debug: devOnly('debug', prefix),
+  };
+}
+
+export const logger = {
+  ...createLoggerInstance(),
+  createLogger: (prefix: string) => createLoggerInstance(prefix),
 };
 
 export default logger;