refactor(core): move app para src e padroniza estrutura

src/app/(dashboard)/transactions/loading.tsx

@@ -0,0 +1,32 @@
+import {
+	FilterSkeleton,
+	TransactionsTableSkeleton,
+} from "@/shared/components/skeletons";
+import { Skeleton } from "@/shared/components/ui/skeleton";
+
+/**
+ * Loading state para a página de lançamentos
+ * Mantém o mesmo layout da página final
+ */
+export default function LancamentosLoading() {
+	return (
+		<main className="flex flex-col gap-6">
+			{/* Month Picker placeholder */}
+			<div className="h-[60px] animate-pulse rounded-2xl bg-foreground/10" />
+
+			<div className="space-y-6 pt-4">
+				{/* Header com título e botão */}
+				<div className="flex items-center justify-between">
+					<Skeleton className="h-8 w-48 rounded-2xl bg-foreground/10" />
+					<Skeleton className="h-10 w-40 rounded-2xl bg-foreground/10" />
+				</div>
+
+				{/* Filtros */}
+				<FilterSkeleton />
+
+				{/* Tabela */}
+				<TransactionsTableSkeleton />
+			</div>
+		</main>
+	);
+}