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/cobranza/src/components/Layout.tsx

@@ -6,7 +6,7 @@ export default function Layout({ children }: { children: ReactNode }) {
   return (
     <div className="min-h-screen bg-[#F8FAFC] dark:bg-[#0F172A] text-[#111827] dark:text-[#E2E8F0]">
       <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 h-16 max-w-[1280px] items-center justify-between px-4 sm:px-6">
+        <div className="flex h-16 items-center justify-between px-4 sm:px-6 lg:px-8">
           <div className="flex items-center gap-3">
             <a
               href="/"
@@ -43,7 +43,7 @@ export default function Layout({ children }: { children: ReactNode }) {
           </nav>
         </div>
       </header>
-      <main className="mx-auto max-w-[1280px] px-4 py-8 sm:px-6">{children}</main>
+      <main className="px-4 py-8 sm:px-6 lg:px-8">{children}</main>
     </div>
   )
 }

apps/cobranza/src/index.css

@@ -9,8 +9,11 @@
 }
 
 @layer base {
+  html {
+    -webkit-text-size-adjust: 100%;
+  }
   body {
-    @apply bg-[#F8FAFC] text-[#111827] antialiased;
+    @apply min-h-screen bg-[#F8FAFC] text-[#111827] antialiased;
   }
 
   *:focus-visible {

apps/cobranza/src/pages/DashboardPage.tsx

@@ -237,7 +237,7 @@ export default function DashboardPage() {
       )}
 
       {/* KPIs */}
-      <div className="grid grid-cols-2 gap-4 md:gap-6 lg:grid-cols-4">
+      <div className="grid grid-cols-2 gap-4 md:grid-cols-3 md:gap-6 lg:grid-cols-4 xl:grid-cols-5">
         <KpiCard titulo="Planes activos" valor={activos.length} />
         <KpiCard
           titulo="Al corriente / con atraso"