refactor(frontend): typed auth payload helpers, remove redundant id guard

- schemas.ts: add loginFormToPayload() and registerFormToPayload() — moves field-name translation (password → raw_password) from call sites into the schema boundary where it belongs
- login.tsx/register.tsx: use payload helpers; callers no longer know backend field names
- AuthContext.login: remove !response.id falsiness guard — id is typed as required string; runtime guard contradicts the type contract

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: agusmdev

template/frontend/src/contexts/AuthContext.tsx

@@ -44,9 +44,6 @@ export function AuthProvider({ children, queryClient }: AuthProviderProps) {
   }, [queryClient, router])
 
   const login = useCallback((response: AuthSessionResponse) => {
-    if (!response.id) {
-      throw new Error('No session token returned from server')
-    }
     setAuthToken(response.id)
     setTokenState(response.id)
   }, [])

template/frontend/src/lib/schemas.ts

@@ -30,3 +30,13 @@ export type ItemFormData = z.infer<typeof itemSchema>
 export function itemFormToPayload(data: ItemFormData) {
   return { name: data.name, description: data.description || undefined }
 }
+
+/** Maps login form values to the API payload (field names match the login endpoint). */
+export function loginFormToPayload(data: LoginFormData) {
+  return { email: data.email, password: data.password }
+}
+
+/** Maps register form values to the API payload (renames password → raw_password per backend contract). */
+export function registerFormToPayload(data: RegisterFormData) {
+  return { email: data.email, raw_password: data.password }
+}

template/frontend/src/routes/login.tsx

@@ -7,7 +7,7 @@ import { AuthFormShell } from '@/components/AuthFormShell'
 import { EmailField, PasswordField } from '@/components/AuthFormFields'
 import { API } from '@/lib/api-endpoints'
 import { useAuthSubmit } from '@/hooks/useAuthSubmit'
-import { loginSchema, type LoginFormData } from '@/lib/schemas'
+import { loginSchema, loginFormToPayload, type LoginFormData } from '@/lib/schemas'
 
 export const Route = createFileRoute('/login')({
   validateSearch: (search: Record<string, unknown>) => ({
@@ -26,7 +26,7 @@ function Login() {
   })
 
   const onSubmit = (data: LoginFormData) =>
-    submit({ email: data.email, password: data.password })
+    submit(loginFormToPayload(data))
 
   return (
     <AuthFormShell

template/frontend/src/routes/register.tsx

@@ -7,7 +7,7 @@ import { AuthFormShell } from '@/components/AuthFormShell'
 import { EmailField, PasswordField } from '@/components/AuthFormFields'
 import { API } from '@/lib/api-endpoints'
 import { useAuthSubmit } from '@/hooks/useAuthSubmit'
-import { registerSchema, type RegisterFormData } from '@/lib/schemas'
+import { registerSchema, registerFormToPayload, type RegisterFormData } from '@/lib/schemas'
 
 export const Route = createFileRoute('/register')({
   component: Register,
@@ -26,7 +26,7 @@ function Register() {
   })
 
   const onSubmit = (data: RegisterFormData) =>
-    submit({ email: data.email, raw_password: data.password })
+    submit(registerFormToPayload(data))
 
   return (
     <AuthFormShell