PostHog: we don't use Feature Flags - stop them

src/common/components/3rdparty/PostHogAnalytics.tsx

@@ -94,12 +94,17 @@ export function OptionalPostHogAnalytics() {
         _posthog.init(process.env.NEXT_PUBLIC_POSTHOG_KEY || '', {
           api_host: '/a/ph', // client analytics host - default: process.env.NEXT_PUBLIC_POSTHOG_HOST || 'https://us.i.posthog.com'
           ui_host: 'https://us.posthog.com',
-          defaults: '2025-05-24',
+          defaults: '2026-01-30',
           capture_exceptions: true, // captures exceptions using Error Tracking
           // capture_pageview: false, // we used to handle this manually, but changed to the 'defaults' option which captures pageviews automatically
           // capture_pageleave: true, // we used to track goodbyes, now included in 'defaults'
           person_profiles: 'identified_only',
           disable_surveys: true, // disable surveys
+
+          // disable feature flags; at most we'd check them at boot for surveys
+          advanced_disable_feature_flags: true,
+          advanced_only_evaluate_survey_feature_flags: true,
+
           debug: Release.IsNodeDevBuild, // enable debug mode in development (was: `loaded: (ph) => if (Release.IsNodeDevBuild) ph.debug();`)
         });