fix(ecommerce): quita el doble ring de foco del buscador

El Input base (components/ui/input.tsx) trae focus:border-cyan-500 y
focus:ring-4 focus:ring-cyan-300/30 hardcodeados. La correccion
anterior del buscador solo anulaba focus-visible:ring-0, una variante
distinta a :focus -- el ring cian del componente base seguia
disparandose al hacer click, superpuesto al ring amarillo del wrapper
nuevo (dos anillos visibles a la vez, reportado por el usuario en
produccion tras el deploy de v1.0.190).

focus:border-0 focus:ring-0 anula correctamente ambas utilidades del
Input base via tailwind-merge (mismo variant+propiedad).

workloads/ecommerce/components/search/predictive-search.tsx

@@ -55,7 +55,7 @@ export function PredictiveSearch() {
   return (
     <form onSubmit={submit} className="relative w-full">
       <div className="flex items-center rounded-full border-2 border-slate-200 bg-white pl-5 pr-1.5 shadow-sm transition focus-within:border-ari-marino focus-within:ring-4 focus-within:ring-ari-coral-claro/30">
-        <Input value={query} onChange={(event) => setQuery(event.target.value)} placeholder="Busca juguetes, mochilas, personajes…" className="h-[48px] border-0 bg-transparent p-0 shadow-none focus-visible:ring-0" />
+        <Input value={query} onChange={(event) => setQuery(event.target.value)} placeholder="Busca juguetes, mochilas, personajes…" className="h-[48px] border-0 bg-transparent p-0 shadow-none focus:border-0 focus:ring-0" />
         {query && <button type="button" aria-label="Limpiar búsqueda" className="mr-1 shrink-0 rounded-full p-1.5 text-slate-400 hover:bg-slate-100" onClick={() => setQuery("")}><X className="size-4" /></button>}
         <button type="submit" aria-label="Buscar" className="grid size-10 shrink-0 place-items-center rounded-full bg-ari-marino text-white transition hover:brightness-110">
           <Search className="size-4.5" />