style: ajustes visuais em notificação, timeline e layout

- Alterar ícone de notificação para outline (RiNotification3Line)
- Mudar cor da timeline de parcelas de azul para verde
- Reduzir padding do month picker (p-5 → p-4)
- Remover md:py-6 do layout dashboard

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

components/month-picker/month-navigation.tsx

@@ -79,7 +79,7 @@ export default function MonthNavigation() {
   };
 
   return (
-    <Card className="sticky top-0 z-30 w-full flex-row bg-month-picker text-month-picker-foreground p-5">
+    <Card className="sticky top-0 z-30 w-full flex-row bg-month-picker text-month-picker-foreground p-4">
       <div className="flex items-center gap-1">
         <NavigationButton
           direction="left"