Revert "feat(ui): make dashboard responsive for iPhone and mobile devices"

This reverts commit d3b326e.

The deployment caused reports of blank screens and 400 errors. Reverting to restore stable state while investigating root cause.

apps/web/components/contribuyente-selector.tsx

@@ -52,10 +52,10 @@ export function ContribuyenteSelector() {
     <div className="contribuyente-selector relative">
       <button
         onClick={() => setOpen(!open)}
-        className="flex items-center gap-2 rounded-lg px-2 py-2 text-sm font-medium hover:bg-accent transition-colors sm:px-3"
+        className="flex items-center gap-2 rounded-lg px-3 py-2 text-sm font-medium hover:bg-accent transition-colors"
       >
         <Building2 className="h-4 w-4" />
-        <span className="hidden max-w-[180px] truncate sm:inline">
+        <span className="max-w-[180px] truncate">
           {selected ? selected.nombre : 'Todos los RFCs'}
         </span>
         <ChevronDown className={cn('h-4 w-4 transition-transform', open && 'rotate-180')} />