Fix liveview launch (#3145)

packages/liveview/src/launch.rs

@@ -6,16 +6,21 @@ pub type Config = crate::Config<axum::Router>;
 /// Launches the WebView and runs the event loop, with configuration and root props.
 pub fn launch(
     root: fn() -> Element,
-    contexts: Vec<Box<dyn Fn() -> Box<dyn Any + Send + Sync> + Send + Sync>>,
-    platform_config: Config,
+    contexts: Vec<Box<dyn Fn() -> Box<dyn Any> + Send + Sync>>,
+    platform_configs: Vec<Box<dyn Any>>,
 ) -> ! {
     #[cfg(feature = "multi-thread")]
     let mut builder = tokio::runtime::Builder::new_multi_thread();
     #[cfg(not(feature = "multi-thread"))]
     let mut builder = tokio::runtime::Builder::new_current_thread();
 
+    let config = platform_configs
+        .into_iter()
+        .find_map(|cfg| cfg.downcast::<Config>().ok().map(|cfg| *cfg))
+        .unwrap_or_default();
+
     builder.enable_all().build().unwrap().block_on(async move {
-        platform_config
+        config
             .with_virtual_dom(move || {
                 let mut virtual_dom = VirtualDom::new(root);