chore(analytics): register surface: 'app' super-property#107
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Tags every PostHog event from the mobile app with surface: 'app' so the app's data stays distinguishable from being-website's data in the shared PostHog project (free-tier constraint: 1 project per account). The website does the mirror in MP2EZ/being-website#42 with ph.register({ surface: 'web' }). After both ship, every PostHog dashboard/insight can filter cleanly on where surface = 'app' (or 'web'), and cross-surface funnels (e.g., "saw website /home → installed app → completed onboarding") are distinguishable from same-surface flows. Implementation: small RegisterSurfaceProperty child component rendered inside <PHProvider> that uses usePostHog() + useEffect to call posthog.register({ surface: 'app' }) on mount. ~15 LOC total. No behavior change beyond the new property — events that fire now will have an additional `surface: 'app'` property, nothing else. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
Tags every PostHog event from the mobile app with `surface: 'app'` so the app's data stays distinguishable from being-website's data in the shared PostHog project. The website mirrors this in mp2ez/being-website#42 with `ph.register({ surface: 'web' })`.
Why we share the project
Free tier = 1 project per account. Sharing is the deliberate choice pre-launch because:
The website's full PostHog setup + the §5.2 scoping update (#106) handle the disclosure side. This PR is just the symmetric tagging on the app side.
What changes
Filters like `where surface = 'app'` (or `'web'`) work cleanly across the shared project. Cohorts, funnels, retention insights can all be scoped per surface.
Implementation
Small `RegisterSurfaceProperty` child component inside the existing ``. Uses `usePostHog()` hook to get the initialized instance, registers the super-property in a `useEffect`. ~15 LOC total.
No behavior change beyond the new property:
Test plan
Related
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