add WASM blazor-like thing

go/vdom/mode_native.go

@@ -0,0 +1,7 @@
+//go:build !(js && wasm)
+
+package vdom
+
+// IsClient is false on the server (native). Components use it to guard
+// client-only effects (e.g. fetching) so they don't run during SSR.
+const IsClient = false