Add PostHog analytics and error tracking#216
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Wire PostHog product analytics + error tracking across the Rails API and React SPA, gated entirely on POSTHOG_KEY (off in dev without a key, always off in test). Backend: a singleton PostHog client, an Analytics::Tracker/Config/Events service layer, authoritative domain events (experience create/lifecycle, registration, block open/close, response submitted, avatar saved), and an around_action that reports unexpected controller exceptions. Frontend: a server-injected JSON config block drives a guarded posthog-js module that captures SPA pageviews and exceptions, identifies users by User#id, and groups events per experience; includes a top-level error boundary. Adds backend specs (config, tracker, helper, error reporting, event emission) and a frontend vitest suite (config, client, identity, error boundary).
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Adds PostHog product analytics + error tracking across the Rails API and React SPA, gated entirely on
POSTHOG_KEY(off in dev without a key, always off in test). The backend adds a singleton client and anAnalytics::{Config,Events,Tracker}service layer that emits authoritative domain events (experience create/lifecycle, registration, block open/close, response submitted, avatar saved) plus anaround_actionthat reports unexpected controller exceptions. The frontend uses a server-injected JSON config block to drive a guarded posthog-js module that captures SPA pageviews/exceptions, identifies users byUser#id, groups events per experience, and wraps the app in an error boundary — configured viaPOSTHOG_KEY/POSTHOG_HOST/POSTHOG_SESSION_REPLAY(US cloud default, documented in.env.example). Includes backend specs (config, tracker, helper, error reporting, event emission) and a frontend vitest suite (config, client, identity, error boundary).