fix(sdk-webview): add missing FileDownloadDestination import and fix curly-quote string literal

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

sdk-webview/src/main/java/com/xuqm/sdk/webview/XWebViewView.kt

@@ -42,6 +42,7 @@ import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.LifecycleEventObserver
 import androidx.core.content.ContextCompat
 import androidx.core.content.FileProvider
+import com.xuqm.sdk.file.FileDownloadDestination
 import com.xuqm.sdk.file.FileSDK
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
@@ -565,7 +566,7 @@ fun XWebViewView(
                 pendingUrlDownload.value = null
             },
             title = { Text("需要存储权限") },
-            text = { Text("下载文件需要"所有文件访问权限"，请在设置中授权后将自动继续下载。") },
+            text = { Text("下载文件需要「所有文件访问权限」，请在设置中授权后将自动继续下载。") },
             confirmButton = {
                 TextButton(onClick = {
                     showStoragePermissionDialog = false