fix(settings): corrige background animado do perfil preenchendo cantos

Remove rounded-t-2xl redundante que criava gap branco nos cantos
superiores. O card pai já possui overflow-hidden com rounded-2xl.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/components/settings/settings-content.tsx

@@ -490,7 +490,7 @@ function ProfileEditCard({
   return (
     <Card className="rounded-2xl border border-border/60 bg-white shadow-sm overflow-hidden">
       {/* Header com shader animado */}
-      <div className="relative h-20 overflow-hidden rounded-t-2xl">
+      <div className="relative h-20 overflow-hidden">
         <ShaderBackground className="absolute inset-0 h-full w-full" />
       </div>
       <CardHeader className="pb-4 -mt-10">