feat(export): add book-to-Typst source generator

src/ipc.ts

@@ -0,0 +1,11 @@
+import { invoke } from "@tauri-apps/api/core";
+
+export interface ImageInput {
+  path: string;
+  data: string;
+}
+
+export async function compilePdf(source: string, images: ImageInput[] = []): Promise<Uint8Array> {
+  const buffer = await invoke<ArrayBuffer>("compile_pdf", { source, images });
+  return new Uint8Array(buffer);
+}