Fixed the sso auto login with the htmlisland, and also fixed the extremely slow page reloads in development mode.

package.json

@@ -80,7 +80,7 @@
   "devDependencies": {
     "@types/node": "^25.3.0",
     "@types/react-toggle": "^4.0.5",
-    "@vitejs/plugin-react": "^5.1.4",
+    "@vitejs/plugin-react-swc": "^4.3.0",
     "i18n-unused": "^0.19.0",
     "typescript": "^5.9.3",
     "vite": "^7.3.1"

src/components/common/HtmlIsland.tsx

@@ -31,6 +31,17 @@ const HtmlIsland: React.FC<HtmlIslandProps> = ({
     ): Promise<string> => {
       try {
         const r = await fetch(url, { credentials: "include" });
+        const contentType = r.headers.get("Content-Type") ?? "";
+
+        if (contentType.includes("application/json")) {
+          const json = await r.json();
+
+          if (json.redirectTo) {
+            window.location.assign(json.redirectTo);
+            return "";
+          }
+        }
+
         if (!r.ok) throw new Error(`Failed to load island: ${r.status}`);
         return await r.text();
       } catch (err) {

vite.config.ts

@@ -1,5 +1,5 @@
 import { defineConfig } from "vite";
-import react from "@vitejs/plugin-react";
+import react from "@vitejs/plugin-react-swc";
 
 export default defineConfig({
   plugins: [react()],