feat(import): normalize missing layout sections for reactive resume json (#2799)

* feat(import): normalize missing layout sections for reactive resume json

* chore: add comments

src/integrations/import/reactive-resume-json.tsx

@@ -1,10 +1,69 @@
 import { flattenError, ZodError } from "zod";
-import { type ResumeData, resumeDataSchema } from "@/schema/resume/data";
+import { type ResumeData, resumeDataSchema, sectionTypeSchema } from "@/schema/resume/data";
+
+const BUILT_IN_LAYOUT_SECTION_IDS = sectionTypeSchema.options.filter((section) => section !== "cover-letter");
+
+function normalizeBuiltInSectionsInLayout(data: ResumeData): ResumeData {
+	const pages = data.metadata.layout.pages;
+
+	// Some exported resumes can arrive without any persisted layout pages.
+	if (pages.length === 0) {
+		return {
+			...data,
+			metadata: {
+				...data.metadata,
+				layout: {
+					...data.metadata.layout,
+					pages: [
+						{
+							fullWidth: false,
+							main: [...BUILT_IN_LAYOUT_SECTION_IDS],
+							sidebar: [],
+						},
+					],
+				},
+			},
+		};
+	}
+
+	const existingSectionIds = new Set<string>();
+
+	// Preserve the imported layout and only compute which built-in IDs are missing entirely.
+	for (const page of pages) {
+		for (const sectionId of page.main) existingSectionIds.add(sectionId);
+		for (const sectionId of page.sidebar) existingSectionIds.add(sectionId);
+	}
+
+	const missingSectionIds = BUILT_IN_LAYOUT_SECTION_IDS.filter((sectionId) => !existingSectionIds.has(sectionId));
+
+	if (missingSectionIds.length === 0) return data;
+
+	const [firstPage, ...restPages] = pages;
+
+	return {
+		...data,
+		metadata: {
+			...data.metadata,
+			layout: {
+				...data.metadata.layout,
+				pages: [
+					{
+						...firstPage,
+						// Recover missing built-in sections without reordering the imported layout.
+						main: [...firstPage.main, ...missingSectionIds],
+					},
+					...restPages,
+				],
+			},
+		},
+	};
+}
 
 export class ReactiveResumeJSONImporter {
 	parse(json: string): ResumeData {
 		try {
-			return resumeDataSchema.parse(JSON.parse(json));
+			const parsed = resumeDataSchema.parse(JSON.parse(json));
+			return resumeDataSchema.parse(normalizeBuiltInSectionsInLayout(parsed));
 		} catch (error) {
 			if (error instanceof ZodError) {
 				const errors = flattenError(error);