Survey detail now shows the response funnel (shown -> sent -> dismissed) +
per-question distributions (rating/choice bars, open-text list), keyed by
$survey_id -> $survey_response_<questionId> from the archived definition.
Feature-flag/experiment detail shows per-variant exposure -> conversion with
lift-vs-control + a goal-event selector (signup/decode/trial/checkout/payment).
All from posthog_events; no schema change.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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