Fix streamdown to build browser only

Author: haydenbleasel

.changeset/goofy-trams-work.md

@@ -0,0 +1,5 @@
+---
+"streamdown": patch
+---
+
+build for browser only (fixes ts-router)

packages/streamdown/tsup.config.ts

@@ -10,4 +10,5 @@ export default defineConfig({
   external: ["react", "react-dom"],
   treeshake: true,
   splitting: true,
+  platform: "browser",
 });