fix(electron): fix wallet detail modal buttons

1. Copy address button:
   - Changed from alert() to visual feedback (shows "✓ 已复制")
   - Feedback auto-hides after 2 seconds

2. Explorer link button:
   - Was hardcoded to testnet (true)
   - Now uses getCurrentNetwork() to determine correct explorer URL
   - Links to kavascan.com for mainnet, testnet.kavascan.com for testnet

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

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

backend/mpc-system/services/service-party-app/src/pages/Home.tsx

@@ -82,6 +82,7 @@ export default function Home() {
   const [transferError, setTransferError] = useState<string | null>(null);
   const [preparedTx, setPreparedTx] = useState<PreparedTransaction | null>(null);
   const [isCalculatingMax, setIsCalculatingMax] = useState(false);
+  const [copySuccess, setCopySuccess] = useState(false);
 
   // 计算扣除 Gas 费后的最大可转账金额
   const calculateMaxAmount = async () => {
@@ -248,9 +249,14 @@ export default function Home() {
     setShowQrModal(true);
   };
 
-  const handleCopyAddress = (address: string) => {
-    navigator.clipboard.writeText(address);
-    alert('地址已复制到剪贴板');
+  const handleCopyAddress = async (address: string) => {
+    try {
+      await navigator.clipboard.writeText(address);
+      setCopySuccess(true);
+      setTimeout(() => setCopySuccess(false), 2000);
+    } catch (err) {
+      console.error('Failed to copy address:', err);
+    }
   };
 
   // 打开转账模态框
@@ -714,10 +720,10 @@ export default function Home() {
                   className={styles.primaryButton}
                   onClick={() => handleCopyAddress(selectedShare.evmAddress || '')}
                 >
-                  复制地址
+                  {copySuccess ? '✓ 已复制' : '复制地址'}
                 </button>
                 <a
-                  href={getKavaExplorerUrl(selectedShare.evmAddress || '', true)}
+                  href={getKavaExplorerUrl(selectedShare.evmAddress || '', getCurrentNetwork() === 'testnet')}
                   target="_blank"
                   rel="noopener noreferrer"
                   className={styles.secondaryButton}