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

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

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+import { RiArrowLeftRightLine } from "@remixicon/react";
+import PageDescription from "@/shared/components/page-description";
+
+export const metadata = {
+	title: "Lançamentos | OpenMonetis",
+};
+
+export default function RootLayout({
+	children,
+}: {
+	children: React.ReactNode;
+}) {
+	return (
+		<section className="space-y-6 pt-4">
+			<PageDescription
+				icon={<RiArrowLeftRightLine />}
+				title="Lançamentos"
+				subtitle="Acompanhe todos os lançamentos financeiros do mês selecionado incluindo
+        receitas, despesas e transações previstas. Use o seletor abaixo para
+        navegar pelos meses e visualizar as movimentações correspondentes."
+			/>
+			{children}
+		</section>
+	);
+}

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

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+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>
+	);
+}

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

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+import { triggerRecurringGeneration } from "@/features/recurring/trigger-recurring-generation";
+import { fetchUserPreferences } from "@/features/settings/queries";
+import { LancamentosPage } from "@/features/transactions/components/page/transactions-page";
+import {
+	buildLancamentoWhere,
+	buildOptionSets,
+	buildSluggedFilters,
+	buildSlugMaps,
+	extractLancamentoSearchFilters,
+	getSingleParam,
+	mapLancamentosData,
+	type ResolvedSearchParams,
+} from "@/features/transactions/page-helpers";
+import {
+	fetchLancamentoFilterSources,
+	fetchLancamentos,
+	fetchRecentEstablishments,
+} from "@/features/transactions/queries";
+import MonthNavigation from "@/shared/components/month-picker/month-navigation";
+import { getUserId } from "@/shared/lib/auth/server";
+import { parsePeriodParam } from "@/shared/utils/period";
+
+type PageSearchParams = Promise<ResolvedSearchParams>;
+
+type PageProps = {
+	searchParams?: PageSearchParams;
+};
+
+export default async function Page({ searchParams }: PageProps) {
+	const userId = await getUserId();
+	await triggerRecurringGeneration(userId);
+	const resolvedSearchParams = searchParams ? await searchParams : undefined;
+
+	const periodoParamRaw = getSingleParam(resolvedSearchParams, "periodo");
+	const { period: selectedPeriod } = parsePeriodParam(periodoParamRaw);
+
+	const searchFilters = extractLancamentoSearchFilters(resolvedSearchParams);
+
+	const [filterSources, userPreferences] = await Promise.all([
+		fetchLancamentoFilterSources(userId),
+		fetchUserPreferences(userId),
+	]);
+
+	const sluggedFilters = buildSluggedFilters(filterSources);
+	const slugMaps = buildSlugMaps(sluggedFilters);
+
+	const filters = buildLancamentoWhere({
+		userId,
+		period: selectedPeriod,
+		filters: searchFilters,
+		slugMaps,
+	});
+
+	const [lancamentoRows, estabelecimentos] = await Promise.all([
+		fetchLancamentos(filters),
+		fetchRecentEstablishments(userId),
+	]);
+	const lancamentosData = mapLancamentosData(lancamentoRows);
+
+	const {
+		pagadorOptions,
+		splitPagadorOptions,
+		defaultPagadorId,
+		contaOptions,
+		cartaoOptions,
+		categoriaOptions,
+		pagadorFilterOptions,
+		categoriaFilterOptions,
+		contaCartaoFilterOptions,
+	} = buildOptionSets({
+		...sluggedFilters,
+		pagadorRows: filterSources.pagadorRows,
+	});
+
+	return (
+		<main className="flex flex-col gap-6">
+			<MonthNavigation />
+			<LancamentosPage
+				currentUserId={userId}
+				lancamentos={lancamentosData}
+				pagadorOptions={pagadorOptions}
+				splitPagadorOptions={splitPagadorOptions}
+				defaultPagadorId={defaultPagadorId}
+				contaOptions={contaOptions}
+				cartaoOptions={cartaoOptions}
+				categoriaOptions={categoriaOptions}
+				pagadorFilterOptions={pagadorFilterOptions}
+				categoriaFilterOptions={categoriaFilterOptions}
+				contaCartaoFilterOptions={contaCartaoFilterOptions}
+				selectedPeriod={selectedPeriod}
+				estabelecimentos={estabelecimentos}
+				noteAsColumn={userPreferences?.extratoNoteAsColumn ?? false}
+				columnOrder={userPreferences?.lancamentosColumnOrder ?? null}
+			/>
+		</main>
+	);
+}