feat: add semantic CSS stylesheets (#3274)

Co-authored-by: Cursor Agent <cursoragent@cursor.com>

apps/web/src/features/resume/stylesheet/pdf-inspection.ts

@@ -0,0 +1,39 @@
+let pdfModule: Promise<typeof import("pdfjs-dist/legacy/build/pdf.mjs")>;
+
+const loadPdfModule = () => (pdfModule ??= import("pdfjs-dist/legacy/build/pdf.mjs"));
+
+const createNestedWorker = () =>
+	new Worker(new URL("pdfjs-dist/legacy/build/pdf.worker.min.mjs", import.meta.url), {
+		type: "module",
+		name: "semantic-css-pdfjs",
+	});
+
+export async function initializePdfInspection(): Promise<void> {
+	await loadPdfModule();
+}
+
+export async function inspectPdfPageCount(
+	pdf: ArrayBuffer,
+	createWorker: () => Worker = createNestedWorker,
+): Promise<number> {
+	const { PDFWorker, getDocument } = await loadPdfModule();
+	const nestedWorker = createWorker();
+	const WorkerWithPort = PDFWorker as unknown as new (options: { port: Worker }) => InstanceType<typeof PDFWorker>;
+	const worker = new WorkerWithPort({ port: nestedWorker });
+	let loadingTask: ReturnType<typeof getDocument> | undefined;
+
+	try {
+		// PDF.js transfers its input to the nested worker and detaches the buffer.
+		// Keep the caller's buffer intact so preflight can return those same bytes.
+		loadingTask = getDocument({ data: pdf.slice(0), worker });
+		const document = await loadingTask.promise;
+		return document.numPages;
+	} finally {
+		try {
+			if (loadingTask) await loadingTask.destroy();
+			else worker.destroy();
+		} finally {
+			nestedWorker.terminate();
+		}
+	}
+}