feat:iOS support zoom scale

Author: KevinnZou

webview/src/iosMain/kotlin/com/multiplatform/webview/web/WKNavigationDelegate.kt

@@ -41,8 +41,10 @@ class WKNavigationDelegate(
         webView: WKWebView,
         didCommitNavigation: WKNavigation?,
     ) {
+        val supportZoom = if (state.webSettings.supportZoom) "yes" else "no"
+
         @Suppress("ktlint:standard:max-line-length")
-        val script = "var meta = document.createElement('meta');meta.setAttribute('name', 'viewport');meta.setAttribute('content', 'width=device-width, initial-scale=${state.webSettings.zoomLevel}, maximum-scale=10.0, minimum-scale=0.1,user-scalable=yes');document.getElementsByTagName('head')[0].appendChild(meta);"
+        val script = "var meta = document.createElement('meta');meta.setAttribute('name', 'viewport');meta.setAttribute('content', 'width=device-width, initial-scale=${state.webSettings.zoomLevel}, maximum-scale=10.0, minimum-scale=0.1,user-scalable=$supportZoom');document.getElementsByTagName('head')[0].appendChild(meta);"
         webView.evaluateJavaScript(script) { _, _ -> }
         KLogger.info { "didCommitNavigation" }
     }