Wizzo v0.21.3 Release Notes

Fixes

• Removed legacy `invite_codes` table from gated beta phase (replaced by referral system in Sprint 17+)
• Dropped unused `users.invite_code` column that was causing migration conflicts
• Removed deprecated `validateInviteCode()` and `markInviteCodeAsUsed()` helper functions
• Resolved database schema drift issues between environments
• Re-enabled AI insights tests with proper keyword triggers (100% test pass rate maintained)
• Fixed test isolation issues in `AIChatInterface.insights.test.tsx` and `AIChatInterface.streaming.test.tsx`