fix: allow file access for local offline packages

app/src/main/java/top/yeij/hearth/webview/WebViewManager.kt

@@ -56,6 +56,11 @@ class WebViewManager(private val activity: Activity) {
             loadWithOverviewMode = true
             setSupportZoom(false)
             domStorageEnabled = true
+            // Android 11 + targetSdk 30 默认禁用 file:// 访问，本地离线包需要显式开启
+            // Android 11 + targetSdk 30 disables file:// by default; local offline
+            // packages need it explicitly enabled
+            allowFileAccess = true
+            allowContentAccess = true
         }
     }