Add simplified user registration endpoint.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 705f2157-ef97-4fbd-89e4-8c7f2ecaea90
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/7ed01c5f-a82d-405a-b728-b2e3d127c60c/6d7c58e6-0cd9-4f69-81f7-091dce31abab.jpg

client/src/pages/auth-page.tsx

@@ -100,18 +100,29 @@ export default function AuthPage() {
     },
   });
 
-  // Register mutation
+  // Register mutation - using our simplified endpoint
   const registerMutation = useMutation({
     mutationFn: async (credentials: any) => {
-      const res = await apiRequest("POST", "/api/register", credentials);
-      return await res.json();
+      try {
+        const res = await apiRequest("POST", "/api/simple-register", credentials);
+        if (!res.ok) {
+          const errorData = await res.json();
+          throw new Error(errorData.message || "Registration failed");
+        }
+        return await res.json();
+      } catch (error) {
+        console.error("Registration error:", error);
+        throw error instanceof Error ? error : new Error("Unknown registration error");
+      }
     },
-    onSuccess: (user) => {
+    onSuccess: (response) => {
       toast({
         title: "Registration successful",
-        description: `Welcome, ${user.username}!`,
+        description: response.message || `Welcome, ${response.username}!`,
       });
-      navigate('/');
+      // Switch to login tab automatically
+      const loginTab = document.querySelector('[data-state="inactive"][data-value="login"]') as HTMLElement;
+      if (loginTab) loginTab.click();
     },
     onError: (error: Error) => {
       toast({