fix(responsive): layout 100% width en todas las resoluciones

- Eliminado max-w-[1280px] de todas las apps (mi-dia, landing, cotizador, cobranza, dashboards, alta-clientes)
- Kanban: sin restricción de ancho, columnas min-w-[220px]
- Grids: xl:grid-cols-4/5 para pantallas grandes
- CSS base: -webkit-text-size-adjust + min-h-screen
- 6 apps construidas

apps/alta-clientes/src/components/AppHeader.tsx

@@ -10,7 +10,7 @@ interface Props {
 export default function AppHeader({ titulo, acciones }: Props) {
   return (
     <header className="sticky top-0 z-10 border-b border-[#E5E7EB] bg-white/95 backdrop-blur dark:border-[#1E293B] dark:bg-[#1E293B]/95">
-      <div className="mx-auto flex min-h-14 max-w-[1280px] flex-wrap items-center gap-x-3 gap-y-2 px-4 py-2 sm:px-6">
+      <div className="flex min-h-14 flex-wrap items-center gap-x-3 gap-y-2 px-4 py-2 sm:px-6 lg:px-8">
         <a
           href="/"
           className="rounded-lg px-2 py-1.5 text-xs font-medium text-[#64748B] dark:text-[#94A3B8] transition-all duration-100 ease-out hover:bg-[#F9FAFB] hover:text-[#111827] dark:text-[#E2E8F0]"