fix(campanha): B133 typecheck — optional catalog subtitle + chrome component return

Co-authored-by: Francisco Solla <fsolla@users.noreply.github.com>

src/components/campaign/municipality/MunicipalityListPageChrome.tsx

@@ -15,7 +15,7 @@ const IGNORED_PARAMS = ['page']
  * When the current URL matches a saved municipality filter, the filter name
  * becomes the page subtitle (B133) — the bar keeps chips as the editable recorte.
  */
-export const MunicipalityListPageChrome = (): null => {
+export const MunicipalityListPageChrome = () => {
   const savedFilters = useMunicipalitySavedFilters()
   const pathname = usePathname()
   const searchParams = useSearchParams()

src/lib/campaignPageChrome.ts

@@ -97,7 +97,9 @@ const resolveCatalogEntry = (
   entry: (typeof campaignPageChromeCatalog)[keyof typeof campaignPageChromeCatalog],
 ): CampaignPageChrome | null => {
   if (!entry) return null
-  return { title: entry.title, subtitle: entry.subtitle }
+  return 'subtitle' in entry && entry.subtitle
+    ? { title: entry.title, subtitle: entry.subtitle }
+    : { title: entry.title }
 }
 
 const sectionOnly = (title: string): CampaignPageChrome => ({ title })