fix: harden unicode safety checks

docs/ja-JP/skills/frontend-patterns/SKILL.md

@@ -12,7 +12,7 @@ React、Next.js、高性能ユーザーインターフェースのためのモ
 ### 継承よりコンポジション
 
 ```typescript
-// ✅ GOOD: Component composition
+// PASS: GOOD: Component composition
 interface CardProps {
   children: React.ReactNode
   variant?: 'default' | 'outlined'
@@ -283,17 +283,17 @@ export function useMarkets() {
 ### メモ化
 
 ```typescript
-// ✅ useMemo for expensive computations
+// PASS: useMemo for expensive computations
 const sortedMarkets = useMemo(() => {
   return markets.sort((a, b) => b.volume - a.volume)
 }, [markets])
 
-// ✅ useCallback for functions passed to children
+// PASS: useCallback for functions passed to children
 const handleSearch = useCallback((query: string) => {
   setSearchQuery(query)
 }, [])
 
-// ✅ React.memo for pure components
+// PASS: React.memo for pure components
 export const MarketCard = React.memo<MarketCardProps>(({ market }) => {
   return (
     <div className="market-card">
@@ -309,7 +309,7 @@ export const MarketCard = React.memo<MarketCardProps>(({ market }) => {
 ```typescript
 import { lazy, Suspense } from 'react'
 
-// ✅ Lazy load heavy components
+// PASS: Lazy load heavy components
 const HeavyChart = lazy(() => import('./HeavyChart'))
 const ThreeJsBackground = lazy(() => import('./ThreeJsBackground'))
 
@@ -504,7 +504,7 @@ export class ErrorBoundary extends React.Component<
 ```typescript
 import { motion, AnimatePresence } from 'framer-motion'
 
-// ✅ List animations
+// PASS: List animations
 export function AnimatedMarketList({ markets }: { markets: Market[] }) {
   return (
     <AnimatePresence>
@@ -523,7 +523,7 @@ export function AnimatedMarketList({ markets }: { markets: Market[] }) {
   )
 }
 
-// ✅ Modal animations
+// PASS: Modal animations
 export function Modal({ isOpen, onClose, children }: ModalProps) {
   return (
     <AnimatePresence>