fix(wizard): cache geo singleton, feedback carga, debounce draft

geo_paraguay_full.json se cargaba dos veces sin cache compartido.
Módulo lib/geo-cache.ts singleton: un fetch para toda la sesión.
Feedback visual mientras carga (disabled + placeholder) y si falla
(mensaje + texto libre). debounce 500ms en saveDraft para no escribir
en localStorage en cada keystroke.

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

components/widgets/barrio-autocomplete-field.tsx

@@ -1,7 +1,6 @@
 'use client'
 import { useState, useEffect, useRef, type CSSProperties, type ReactNode } from 'react'
-
-type GeoData = Record<string, Record<string, string[]>>
+import { getGeoData, type GeoData } from '@/lib/geo-cache'
 
 interface BarrioAutocompleteFieldProps {
   name: string
@@ -25,16 +24,16 @@ export function BarrioAutocompleteField({
   error,
 }: BarrioAutocompleteFieldProps) {
   const [geoData, setGeoData] = useState<GeoData | null>(null)
+  const [geoStatus, setGeoStatus] = useState<'loading' | 'ready' | 'error'>('loading')
   const [open, setOpen] = useState(false)
   const [activeIdx, setActiveIdx] = useState(-1)
   const [dropdownStyle, setDropdownStyle] = useState<CSSProperties>({})
   const inputRef = useRef<HTMLInputElement>(null)
 
   useEffect(() => {
-    fetch('/data/geo_paraguay_full.json')
-      .then((r) => r.json())
-      .then(setGeoData)
-      .catch(() => {})
+    getGeoData()
+      .then((data) => { setGeoData(data); setGeoStatus('ready') })
+      .catch(() => setGeoStatus('error'))
   }, [])
 
   // Close dropdown on scroll so the fixed-position list doesn't drift from the input
@@ -126,6 +125,12 @@ export function BarrioAutocompleteField({
           autoComplete="off"
           className="text-short-input"
           ref={inputRef}
+          disabled={geoStatus === 'loading'}
+          placeholder={
+            geoStatus === 'loading' ? 'Cargando opciones...' :
+            geoStatus === 'error' ? 'No se pudieron cargar las opciones. Podés escribir el nombre manualmente.' :
+            undefined
+          }
           onChange={(e) => handleInput(e.target.value)}
           onKeyDown={handleKeyDown}
           onFocus={() => { if (suggestions.length > 0) { computeDropdownStyle(); setOpen(true) } }}

components/widgets/ciudad-select-field.tsx

@@ -1,7 +1,6 @@
 'use client'
 import { useState, useEffect, useRef, type CSSProperties, type ReactNode } from 'react'
-
-type GeoData = Record<string, Record<string, string[]>>
+import { getGeoData, type GeoData } from '@/lib/geo-cache'
 
 interface CiudadSelectFieldProps {
   name: string
@@ -23,6 +22,7 @@ export function CiudadSelectField({
   error,
 }: CiudadSelectFieldProps) {
   const [geoData, setGeoData] = useState<GeoData | null>(null)
+  const [geoStatus, setGeoStatus] = useState<'loading' | 'ready' | 'error'>('loading')
   const [open, setOpen] = useState(false)
   const [activeIdx, setActiveIdx] = useState(-1)
   const [dropdownStyle, setDropdownStyle] = useState<CSSProperties>({})
@@ -35,10 +35,9 @@ export function CiudadSelectField({
   const prevDeptoRef = useRef(departamento)
 
   useEffect(() => {
-    fetch('/data/geo_paraguay_full.json')
-      .then((r) => r.json())
-      .then(setGeoData)
-      .catch(() => {})
+    getGeoData()
+      .then((data) => { setGeoData(data); setGeoStatus('ready') })
+      .catch(() => setGeoStatus('error'))
   }, [])
 
   // Clear city when departamento changes so no orphan value remains
@@ -130,6 +129,12 @@ export function CiudadSelectField({
           autoComplete="off"
           className="text-short-input"
           ref={inputRef}
+          disabled={geoStatus === 'loading'}
+          placeholder={
+            geoStatus === 'loading' ? 'Cargando opciones...' :
+            geoStatus === 'error' ? 'No se pudieron cargar las opciones. Podés escribir el nombre manualmente.' :
+            undefined
+          }
           onChange={(e) => handleInput(e.target.value)}
           onKeyDown={handleKeyDown}
           onFocus={() => { if (suggestions.length > 0) { computeDropdownStyle(); setOpen(true) } }}

components/wizard-form.tsx

@@ -70,7 +70,8 @@ export function WizardForm({ survey, schema }: WizardFormProps) {
 
   useEffect(() => {
     if (!hydrated) return
-    saveDraft(survey.id, state.answers)
+    const timer = setTimeout(() => saveDraft(survey.id, state.answers), 500)
+    return () => clearTimeout(timer)
   }, [state.answers, hydrated, survey.id])
 
   const screens = resolveScreens(schema, state.answers)
@@ -192,10 +193,12 @@ export function WizardForm({ survey, schema }: WizardFormProps) {
       setErrors((e) => ({ ...e, [screen.question!.code]: 'Este campo es obligatorio.' }))
       return
     }
+    saveDraft(survey.id, state.answers)
     setState((s) => next(s, schema))
   }
 
   function handleBack() {
+    saveDraft(survey.id, state.answers)
     setState((s) => back(s, schema))
   }
 

lib/geo-cache.ts

@@ -0,0 +1,16 @@
+// departamento → ciudad → barrios[]
+export type GeoData = Record<string, Record<string, string[]>>
+
+let geoData: GeoData | null = null
+let geoPromise: Promise<GeoData> | null = null
+
+export async function getGeoData(): Promise<GeoData> {
+  if (geoData) return geoData
+  if (!geoPromise) {
+    geoPromise = fetch('/data/geo_paraguay_full.json')
+      .then((r) => r.json())
+      .then((data: GeoData) => { geoData = data; return data })
+      .catch((err) => { geoPromise = null; throw err })
+  }
+  return geoPromise
+}