feat: 添加交易历史、错误提示和打包优化

1. 交易历史记录功能
   - 新增 useTransactionHistory hook 管理交易记录
   - 新增 TransactionHistory 组件显示历史
   - 交易记录保存到 localStorage

2. 错误处理和用户提示
   - 新增 Toast 通知组件
   - 交易提交/成功/失败时显示提示
   - 解析并显示友好的错误信息

3. 打包优化
   - 配置代码分割 (manualChunks)
   - 分离 react/web3/walletconnect/i18n
   - 提高 chunk 大小警告阈值

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/src/hooks/useTransactionHistory.ts

@@ -0,0 +1,82 @@
+import { useState, useEffect } from 'react'
+
+export type TransactionType = 'mint' | 'burn' | 'buy' | 'sell' | 'approve' | 'create_vault' | 'update_price' | 'test'
+
+export interface TransactionRecord {
+  id: string
+  type: TransactionType
+  hash: string
+  timestamp: number
+  status: 'pending' | 'success' | 'failed'
+  amount?: string
+  token?: string
+  vault?: string
+  error?: string
+}
+
+const STORAGE_KEY = 'yt_asset_tx_history'
+const MAX_RECORDS = 50
+
+export function useTransactionHistory() {
+  const [transactions, setTransactions] = useState<TransactionRecord[]>([])
+
+  // 从 localStorage 加载历史记录
+  useEffect(() => {
+    try {
+      const stored = localStorage.getItem(STORAGE_KEY)
+      if (stored) {
+        setTransactions(JSON.parse(stored))
+      }
+    } catch (e) {
+      console.error('Failed to load transaction history:', e)
+    }
+  }, [])
+
+  // 保存到 localStorage
+  const saveToStorage = (records: TransactionRecord[]) => {
+    try {
+      localStorage.setItem(STORAGE_KEY, JSON.stringify(records.slice(0, MAX_RECORDS)))
+    } catch (e) {
+      console.error('Failed to save transaction history:', e)
+    }
+  }
+
+  // 添加新交易
+  const addTransaction = (tx: Omit<TransactionRecord, 'id' | 'timestamp'>) => {
+    const newTx: TransactionRecord = {
+      ...tx,
+      id: `${Date.now()}-${Math.random().toString(36).substr(2, 9)}`,
+      timestamp: Date.now(),
+    }
+    setTransactions(prev => {
+      const updated = [newTx, ...prev].slice(0, MAX_RECORDS)
+      saveToStorage(updated)
+      return updated
+    })
+    return newTx.id
+  }
+
+  // 更新交易状态
+  const updateTransaction = (id: string, updates: Partial<TransactionRecord>) => {
+    setTransactions(prev => {
+      const updated = prev.map(tx =>
+        tx.id === id ? { ...tx, ...updates } : tx
+      )
+      saveToStorage(updated)
+      return updated
+    })
+  }
+
+  // 清空历史记录
+  const clearHistory = () => {
+    setTransactions([])
+    localStorage.removeItem(STORAGE_KEY)
+  }
+
+  return {
+    transactions,
+    addTransaction,
+    updateTransaction,
+    clearHistory,
+  }
+}