fix(posthog): guard startSessionRecording against repeated calls on refetch

The effect fires on every session reload (e.g., subscription upgrade).
Calling startSessionRecording() while already recording fragments the
session in the analytics dashboard. Add sessionRecordingStarted() guard
so recording only starts once per page lifecycle.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: emir-karabeg

apps/sim/app/_shell/providers/session-provider.tsx

@@ -92,7 +92,10 @@ export function SessionProvider({ children }: { children: React.ReactNode }) {
               email_verified: data.user.emailVerified,
               created_at: data.user.createdAt,
             })
-            if (typeof posthog.startSessionRecording === 'function') {
+            if (
+              typeof posthog.startSessionRecording === 'function' &&
+              !posthog.sessionRecordingStarted()
+            ) {
               posthog.startSessionRecording()
             }
           } else {