fix: render cover letter exports without resume chrome

packages/docx/src/cover-letter.ts

@@ -0,0 +1,15 @@
+import type { ResumeData } from "@reactive-resume/schema/resume/data";
+
+const isCoverLetterSection = (data: ResumeData, sectionId: string) => {
+	const section = data.customSections.find((customSection) => customSection.id === sectionId);
+
+	return section?.type === "cover-letter" && !section.hidden && section.items.some((item) => !item.hidden);
+};
+
+const isCoverLetterOnlyDocument = (data: ResumeData) => {
+	const sectionIds = data.metadata.layout.pages.flatMap((page) => [...page.main, ...page.sidebar]);
+
+	return sectionIds.length > 0 && sectionIds.every((sectionId) => isCoverLetterSection(data, sectionId));
+};
+
+export const shouldShowResumeHeader = (data: ResumeData) => !isCoverLetterOnlyDocument(data);