Add Firebase Analytics (GA4) funnel tracking to client_app: - AnalyticsService typed wrapper (enum-gated, no PII) + analyticsProvider - FirebaseAnalyticsObserver on GoRouter (screen_name via nameExtractor) - user_id = customer UUID, user_type property, set on auth resolve/upgrade - funnel events: curhat_start, curhat_repeat_start, auth_*, onboarding_usp_view, payment_view, payment_method_select, payment_started, pairing_matched/no_bestie - bottom-sheet events: verif_choice_view/select, bestie_choice_view/select, extension_offer_view, chat_extension_requested - payment_started carries app_instance_id + ga_session_id in the /payment-requests body for future server-side stitching (backend ignores) - curhat_mode_pick screen name disambiguates the chat/call mode picker (/payment/method-pick) from the payment-channel picker (/payment/method) - unify both home CTAs to "Aku Mau Curhat" Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
client_app
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