fix(observability): use disable_session_recording PostHog option

posthog-js v1.x does not accept session_recording.enabled on init;
use the documented disable_session_recording flag instead. Inverts
the cfg.posthog.sessionRecording flag to produce the correct value.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: twn-lloyd

packages/observability/src/modules/observability/widgets/injection/admin-shell/widget.client.tsx

@@ -28,7 +28,7 @@ export default function AdminShellObservability() {
         posthog.init(cfg.posthog.key, {
           api_host: cfg.posthog.host,
           autocapture: true,
-          session_recording: { enabled: cfg.posthog.sessionRecording ?? false },
+          disable_session_recording: !(cfg.posthog.sessionRecording ?? false),
           person_profiles: 'identified_only',
         })
       }

packages/observability/src/modules/observability/widgets/injection/portal-shell/widget.client.tsx

@@ -28,7 +28,7 @@ export default function PortalShellObservability() {
         posthog.init(cfg.posthog.key, {
           api_host: cfg.posthog.host,
           autocapture: true,
-          session_recording: { enabled: cfg.posthog.sessionRecording ?? false },
+          disable_session_recording: !(cfg.posthog.sessionRecording ?? false),
           person_profiles: 'identified_only',
         })
       }