fix(test): clear CLOAKBROWSER_BINARY_PATH in puppeteer mock tests

Env var override takes precedence over ensureBinary mock, causing
test to fail in Docker where the var is always set.

js/tests/puppeteer.test.ts

@@ -22,6 +22,7 @@ describe("puppeteer launch", () => {
   let mockBrowser: any;
 
   beforeEach(async () => {
+    delete process.env.CLOAKBROWSER_BINARY_PATH;
     puppeteerMock = await import("puppeteer-core");
     mockBrowser = {
       newPage: vi.fn().mockResolvedValue({