fix(auth): correctly identify posthog users via backend on load

[jpdevhub]

Summary by cubic

Fixes posthog-js user identification by fetching the user profile from the backend and identifying on app load and auth changes. Removes fragile JWT-based identification to ensure consistent IDs and correct attribution.

• Bug Fixes
  • Identify via api.getMe() when isAuthenticated(), using profile.id, email, and full_name.
  • Trigger identification on initial load and on auth-change events.
  • Remove JWT decoding from AuthPage and centralize identification in PostHogPageView.

^{Written for commit 621d0c9. Summary will update on new commits. Review in cubic}

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Project	Deployment	Actions	Updated (UTC)
fresh-scan-ai	Ready	Preview, Comment	May 27, 2026 9:54am