fix(webview): 解决文件选择器MIME类型解析和通知ID空指针问题

- 修复了文件下载通知中notifId为空时的崩溃问题
- 为XWebViewJsBridge添加了额外的回调参数以支持消息处理
- 重构了resolvePickerMimeType函数的文档注释并优化了MIME类型解析逻辑
- 将文件选择器的MIME类型解析逻辑统一到resolvePickerMimeType函数中
- 改进了HTML accept类型的转换机制，更好地支持混合和未知MIME类型

sdk-core/src/main/java/com/xuqm/sdk/file/FileSDK.kt

@@ -190,12 +190,15 @@ object FileSDK {
                 .also { NotificationManagerCompat.from(context).notify(id, it.build()) }
         }
 
+        val capturedNotifId = notifId
         try {
             FileTransfer.downloadToFile(downloadUrl, target) { progress ->
+                if (capturedNotifId != null) {
                     notifBuilder?.let { builder ->
                         builder.setProgress(100, progress, false)
                         if (NotificationManagerCompat.from(context).areNotificationsEnabled()) {
-                        NotificationManagerCompat.from(context).notify(notifId!!, builder.build())
+                            NotificationManagerCompat.from(context).notify(capturedNotifId, builder.build())
+                        }
                     }
                 }
                 onProgress(progress)

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

@@ -100,7 +100,7 @@ class XWebViewActivity : ComponentActivity() {
             config.userAgent?.let { settings.userAgentString = it }
 
             addJavascriptInterface(
-                XWebViewJsBridge(mainHandler) { config.onMessage },
+                XWebViewJsBridge(mainHandler, { config.onMessage }, { null }),
                 config.jsBridgeName,
             )
 
@@ -155,9 +155,7 @@ class XWebViewActivity : ComponentActivity() {
                             fileCameraPermissionLauncher.launch(Manifest.permission.CAMERA)
                         }
                     } else {
-                        val mimeType = fileChooserParams.acceptTypes
-                            .firstOrNull { it.isNotBlank() } ?: "image/*"
-                        pickContentLauncher.launch(mimeType)
+                        pickContentLauncher.launch(resolvePickerMimeType(fileChooserParams.acceptTypes))
                     }
                     return true
                 }

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

@@ -42,11 +42,8 @@ import org.json.JSONObject
 import java.io.File
 import java.util.Locale
 
-/**
- * Converts an array of HTML accept types (MIME types or dot-prefixed extensions like ".docx")
- * into a single MIME type string suitable for ACTION_GET_CONTENT.
- * Falls back to "*\/*" when types are mixed, unknown, or empty.
- */
+// Maps HTML accept types (MIME or dot-prefixed extensions) to a single MIME for ACTION_GET_CONTENT.
+// Returns "*/*" when types are empty, mixed, or cannot be resolved.
 internal fun resolvePickerMimeType(acceptTypes: Array<String>): String {
     val nonBlank = acceptTypes.filter { it.isNotBlank() }
     if (nonBlank.isEmpty()) return "*/*"