Turns out the issues were not these PRs

Summary by cubic

Enables Onboarding v3 for all users and updates E2E tests to the new flow and routes. Adds stable test IDs for the continue actions.

• Refactors

  • Updated Playwright tests to use /onboarding/* paths and accept legacy paths where needed; simplified flow to plan selection → personal settings → calendar → redirect to /event-types.
  • Added data-testid="onboarding-continue-btn" to onboarding continue buttons.

• Migration

  • Enables the onboarding-v3 feature flag via SQL migration.

^{Written for commit 87a9241. Summary will update on new commits.}