fix: update PostHog import to support both ESM and CommonJS environments (#696)

* fix: update PostHog import to support both ESM and CommonJS environments

Co-Authored-By: Max Prilutskiy <maks.prilutskiy@gmail.com>

* fix: update test file to properly handle PostHog mocking

Co-Authored-By: Max Prilutskiy <maks.prilutskiy@gmail.com>

* fix: update test file to use vi.hoisted() for proper mock hoisting

Co-Authored-By: Max Prilutskiy <maks.prilutskiy@gmail.com>

* chore: remove observability tests as requested

Co-Authored-By: Max Prilutskiy <maks.prilutskiy@gmail.com>

---------

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: Max Prilutskiy <maks.prilutskiy@gmail.com>

Author: devin-ai-integration[bot]

.changeset/fix-posthog-import.md

@@ -0,0 +1,5 @@
+---
+"lingo.dev": patch
+---
+
+Fix PostHog import in CLI to support both ESM and CommonJS environments

packages/cli/src/cli/utils/observability.ts

@@ -1,4 +1,5 @@
-import { PostHog } from "posthog-node";
+import pkg from "posthog-node";
+const { PostHog } = pkg;
 
 export default async function trackEvent(distinctId: string, event: string, properties?: Record<string, any>) {
   if (process.env.DO_NOT_TRACK) {