.log

# Execution Log

## 2024-12-23 fix: Plan name shows as undefined on upgrade page

- **Root cause:** Components passed undefined planId directly to getPlanById(), which returns undefined. This undefined value was rendered as text "undefined" in the UI when users had no subscription.
- **Solution:** Added two new helper functions:
  - `getDisplayPlanName(planId)` - Returns "Free" for undefined/null/unknown planIds
  - `getPlanOrDefault(planId)` - Returns Free plan object for undefined/null/unknown planIds
  - Updated UpgradePage.tsx and BillingOverview.tsx to use getPlanOrDefault()
- **Files changed:**
  - src/lib/plans.ts (added helper functions)
  - src/components/UpgradePage.tsx (use getPlanOrDefault)
  - src/components/BillingOverview.tsx (use getPlanOrDefault)
  - tests/plan-display.test.ts (added verification tests)
- **Tests:** 19 passing