fix: use window.location.origin for Google callback URL and remove redundant whitespace in auth config

apps/backend/src/lib/auth.ts

@@ -23,7 +23,6 @@ export const auth = betterAuth({
       clientSecret: process.env.GOOGLE_CLIENT_SECRET!,
     },
   },
-  
   trustedOrigins: [
     process.env.APP_BASE_URL ?? 'http://localhost:5173',
     process.env.BETTER_AUTH_URL ?? 'http://localhost:3000',

apps/frontend/src/features/login/login-page.tsx

@@ -57,7 +57,7 @@ export function LoginPage({ redirectTo = '/' }: LoginPageProps) {
         provider: 'google',
         callbackURL: redirectTo.startsWith('http')
           ? redirectTo
-          : `http://localhost:5173${redirectTo}`,
+          : `${window.location.origin}${redirectTo}`,
       });
     } catch {
       setSubmitError('No pudimos iniciar sesión con Google.');