Fix ES module import to use .js extension (#33)

The import of './common' was missing the .js extension, which is required
in strict ES module environments. While TypeScript and development tools
handle this gracefully, the compiled output fails when consumed by other
ES module projects.

This fixes the import to use './common.js' as required by ES module spec.

Author: GabiGrin

src/utils/axios-client.ts

@@ -1,5 +1,5 @@
 import axios from "axios";
-import { isInIFrame } from "./common";
+import { isInIFrame } from "./common.js";
 import { v4 as uuidv4 } from "uuid";
 
 export class Base44Error extends Error {