fix: Improve error handling and update demo credentials

- Better error parsing for FastAPI validation errors
- Updated login demo credentials to admin@moxiegen.com
- Improved login API error handling

frontend/src/lib/api.js

@@ -43,8 +43,12 @@ class ApiClient {
     }
 
     if (!response.ok) {
-      const error = await response.json().catch(() => ({ detail: 'Request failed' }));
+      const errorData = await response.json().catch(() => ({ detail: 'Request failed' }));
-      throw new Error(error.detail || 'Request failed');
+      // Handle FastAPI validation errors
+      if (errorData.detail && typeof errorData.detail === 'object') {
+        throw new Error(JSON.stringify(errorData.detail));
+      }
+      throw new Error(errorData.detail || 'Request failed');
     }
 
     if (response.status === 204) {
@@ -55,10 +59,31 @@ class ApiClient {
   }
 
   async login(email, password) {
-    const data = await this.request('/auth/login', {
+    const response = await fetch(`${API_BASE}/auth/login`, {
       method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+      },
       body: JSON.stringify({ email, password }),
     });
+
+    const data = await response.json().catch(() => ({}));
+
+    if (!response.ok) {
+      if (data.detail) {
+        if (typeof data.detail === 'string') {
+          throw new Error(data.detail);
+        }
+        // Validation errors
+        if (Array.isArray(data.detail)) {
+          const messages = data.detail.map(e => e.msg).join(', ');
+          throw new Error(messages);
+        }
+        throw new Error(JSON.stringify(data.detail));
+      }
+      throw new Error('Login failed');
+    }
+
     this.setToken(data.access_token);
     return data;
   }

frontend/src/routes/login/+page.svelte

@@ -82,7 +82,7 @@
 
     <div class="demo-credentials">
       <p><strong>Demo Admin:</strong></p>
-      <p>Email: admin@moxiegen.local</p>
+      <p>Email: admin@moxiegen.com</p>
       <p>Password: admin123</p>
     </div>
   </div>