fix: improve auth sign-in handling and cookie configuration

- Add onSuccess/onError callbacks to signIn.email() for better response handling
- Add trustedOrigins configuration for production domain
- Configure explicit cookie attributes (sameSite, secure, httpOnly)
- Enable session cookie caching for better performance
- Handle edge case where signIn returns neither data nor error

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

apps/web/src/app/(auth)/sign-in/page.tsx

@@ -16,21 +16,40 @@ export default function SignInPage() {
     setLoading(true);
 
     try {
-      const { data, error } = await signIn.email({
-        email,
-        password,
-      });
+      const result = await signIn.email(
+        {
+          email,
+          password,
+        },
+        {
+          onSuccess: () => {
+            // Redirect on successful sign-in
+            window.location.href = '/dashboard';
+          },
+          onError: (ctx) => {
+            console.error('Sign in error:', ctx.error);
+            setError(ctx.error.message || 'Failed to sign in');
+            setLoading(false);
+          },
+        }
+      );
 
-      if (error) {
-        console.error('Sign in error:', error);
-        setError(error.message || 'Failed to sign in');
+      // Handle case where no callback was triggered
+      if (result.error) {
+        console.error('Sign in error:', result.error);
+        setError(result.error.message || 'Failed to sign in');
         setLoading(false);
         return;
       }
 
-      if (data) {
-        // Successfully signed in - redirect to dashboard
+      // If we have data but onSuccess didn't fire, redirect manually
+      if (result.data) {
         window.location.href = '/dashboard';
+      } else {
+        // Neither data nor error - something unexpected happened
+        console.error('Sign in returned no data or error:', result);
+        setError('Sign in failed. Please try again.');
+        setLoading(false);
       }
     } catch (err) {
       console.error('Sign in exception:', err);

apps/web/src/lib/auth.ts

@@ -35,6 +35,18 @@ export const auth = betterAuth({
   session: {
     expiresIn: 60 * 60 * 24 * 7, // 7 days
     updateAge: 60 * 60 * 24, // 1 day
+    cookieCache: {
+      enabled: true,
+      maxAge: 60 * 5, // 5 minutes
+    },
+  },
+  trustedOrigins: ['https://tpmjs.com'],
+  advanced: {
+    defaultCookieAttributes: {
+      sameSite: 'lax',
+      secure: true,
+      httpOnly: true,
+    },
   },
 });