refactor: use browser-compatible csv-parse entry point

Update the `csv-parse` import to use the browser ESM sync version
and remove unused `fs` and `path` imports in `loader.ts`.

src/csv-loader/loader.ts

@@ -1,4 +1,4 @@
-import { parse } from "csv-parse/sync";
+import { parse } from "csv-parse/browser/esm/sync";
 import {
   parseSchema,
   createValidator,
@@ -34,8 +34,6 @@ import {
 } from "./reference-resolver.js";
 import { generateTypeDefinition } from "./type-gen.js";
 import { csvToModule } from "./module-gen.js";
-import * as fs from "fs";
-import * as path from "path";
 import {
   parseTypeDeclaration,
   parseReverseReferenceDeclaration,