fix(android): add copy feedback and explorer link to wallet detail

Matching Electron app functionality:

1. Copy address button:
   - Shows "✓ 已复制" feedback after copying
   - Auto-resets after 2 seconds

2. Explorer link button (new):
   - Opens address in Kava block explorer
   - Uses correct URL based on network type:
     - Mainnet: kavascan.com
     - Testnet: testnet.kavascan.com

Changes:
- WalletsScreen: Added networkType parameter
- WalletDetailDialog: Added copy feedback state and explorer button
- MainActivity: Pass networkType to WalletsScreen

🤖 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-android/app/src/main/java/com/durian/tssparty/MainActivity.kt

@@ -161,6 +161,7 @@ fun TssPartyApp(
                     shares = shares,
                     isConnected = uiState.isConnected,
                     balances = balances,
+                    networkType = settings.networkType,
                     onDeleteShare = { viewModel.deleteShare(it) },
                     onRefreshBalance = { address -> viewModel.fetchBalance(address) },
                     onTransfer = { shareId, toAddress, amount, password ->

backend/mpc-system/services/service-party-android/app/src/main/java/com/durian/tssparty/presentation/screens/WalletsScreen.kt

@@ -32,9 +32,14 @@ import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import androidx.compose.ui.window.Dialog
+import android.content.Intent
+import android.net.Uri
+import com.durian.tssparty.domain.model.NetworkType
 import com.durian.tssparty.domain.model.ShareRecord
 import com.google.zxing.BarcodeFormat
 import com.google.zxing.qrcode.QRCodeWriter
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.launch
 
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
@@ -42,6 +47,7 @@ fun WalletsScreen(
     shares: List<ShareRecord>,
     isConnected: Boolean,
     balances: Map<String, String> = emptyMap(),
+    networkType: NetworkType = NetworkType.MAINNET,
     onDeleteShare: (Long) -> Unit,
     onRefreshBalance: ((String) -> Unit)? = null,
     onTransfer: ((shareId: Long, toAddress: String, amount: String, password: String) -> Unit)? = null,
@@ -175,6 +181,7 @@ fun WalletsScreen(
     selectedWallet?.let { wallet ->
         WalletDetailDialog(
             wallet = wallet,
+            networkType = networkType,
             onDismiss = { selectedWallet = null },
             onTransfer = {
                 selectedWallet = null
@@ -385,12 +392,16 @@ private fun WalletItemCard(
 @Composable
 private fun WalletDetailDialog(
     wallet: ShareRecord,
+    networkType: NetworkType = NetworkType.MAINNET,
     onDismiss: () -> Unit,
     onTransfer: () -> Unit,
     onExport: ((String) -> Unit)?
 ) {
     val clipboardManager = LocalClipboardManager.current
+    val context = androidx.compose.ui.platform.LocalContext.current
+    val scope = rememberCoroutineScope()
     var showExportDialog by remember { mutableStateOf(false) }
+    var copySuccess by remember { mutableStateOf(false) }
 
     Dialog(onDismissRequest = onDismiss) {
         Card(
@@ -455,19 +466,53 @@ private fun WalletDetailDialog(
 
                 Spacer(modifier = Modifier.height(8.dp))
 
-                // Copy button
-                OutlinedButton(
-                    onClick = {
-                        clipboardManager.setText(AnnotatedString(wallet.address))
-                    }
+                // Action buttons row
+                Row(
+                    modifier = Modifier.fillMaxWidth(),
+                    horizontalArrangement = Arrangement.spacedBy(8.dp)
                 ) {
-                    Icon(
-                        Icons.Default.ContentCopy,
-                        contentDescription = null,
-                        modifier = Modifier.size(18.dp)
-                    )
-                    Spacer(modifier = Modifier.width(8.dp))
-                    Text("复制地址")
+                    // Copy button
+                    OutlinedButton(
+                        onClick = {
+                            clipboardManager.setText(AnnotatedString(wallet.address))
+                            copySuccess = true
+                            scope.launch {
+                                delay(2000)
+                                copySuccess = false
+                            }
+                        },
+                        modifier = Modifier.weight(1f)
+                    ) {
+                        Icon(
+                            if (copySuccess) Icons.Default.Check else Icons.Default.ContentCopy,
+                            contentDescription = null,
+                            modifier = Modifier.size(18.dp)
+                        )
+                        Spacer(modifier = Modifier.width(4.dp))
+                        Text(if (copySuccess) "已复制" else "复制地址")
+                    }
+
+                    // Explorer button
+                    OutlinedButton(
+                        onClick = {
+                            val baseUrl = if (networkType == NetworkType.TESTNET) {
+                                "https://testnet.kavascan.com"
+                            } else {
+                                "https://kavascan.com"
+                            }
+                            val intent = Intent(Intent.ACTION_VIEW, Uri.parse("$baseUrl/address/${wallet.address}"))
+                            context.startActivity(intent)
+                        },
+                        modifier = Modifier.weight(1f)
+                    ) {
+                        Icon(
+                            Icons.Default.OpenInNew,
+                            contentDescription = null,
+                            modifier = Modifier.size(18.dp)
+                        )
+                        Spacer(modifier = Modifier.width(4.dp))
+                        Text("浏览器")
+                    }
                 }
 
                 Spacer(modifier = Modifier.height(16.dp))