feat(lancamentos): adicionar suporte a anexos com upload para storage S3

Permite vincular arquivos (PDF, imagens) a lançamentos via upload direto
para storage compatível com S3, usando token assinado por arquivo e
validação de propriedade na leitura e remoção.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/features/transactions/components/attachments/attachment-section.tsx

@@ -0,0 +1,87 @@
+"use client";
+
+import { useCallback, useEffect, useState } from "react";
+import { fetchTransactionAttachmentsAction } from "@/features/transactions/actions/attachments";
+import { AttachmentItem } from "./attachment-item";
+import { AttachmentUpload } from "./attachment-upload";
+
+type AttachmentRow = {
+	attachmentId: string;
+	fileName: string;
+	fileSize: number;
+	mimeType: string;
+	createdAt: Date;
+	url: string;
+};
+
+interface AttachmentSectionProps {
+	transactionId: string;
+	seriesId: string | null;
+	readonly?: boolean;
+	onLoaded?: (count: number) => void;
+}
+
+export function AttachmentSection({
+	transactionId,
+	seriesId,
+	readonly = false,
+	onLoaded,
+}: AttachmentSectionProps) {
+	const [items, setItems] = useState<AttachmentRow[]>([]);
+	const [isLoading, setIsLoading] = useState(true);
+
+	const load = useCallback(async () => {
+		setIsLoading(true);
+		try {
+			const data = await fetchTransactionAttachmentsAction(transactionId);
+			setItems(data);
+			onLoaded?.(data.length);
+		} finally {
+			setIsLoading(false);
+		}
+	}, [transactionId, onLoaded]);
+
+	useEffect(() => {
+		load();
+	}, [load]);
+
+	return (
+		<div className="min-w-0 space-y-2 overflow-hidden">
+			{isLoading ? (
+				<p className="text-xs text-muted-foreground">Carregando...</p>
+			) : (
+				<>
+					{items.length > 0 ? (
+						<div className="min-w-0 space-y-1.5">
+							{items.map((item) => (
+								<AttachmentItem
+									key={item.attachmentId}
+									attachmentId={item.attachmentId}
+									transactionId={transactionId}
+									fileName={item.fileName}
+									fileSize={item.fileSize}
+									mimeType={item.mimeType}
+									url={item.url}
+									onDeleted={load}
+									readonly={readonly}
+								/>
+							))}
+						</div>
+					) : (
+						readonly && (
+							<p className="text-xs text-muted-foreground">Nenhum anexo.</p>
+						)
+					)}
+
+					{!readonly && (
+						<AttachmentUpload
+							transactionId={transactionId}
+							seriesId={seriesId}
+							onUploaded={load}
+						/>
+					)}
+				</>
+			)}
+		</div>
+	);
+}