Expand test coverage beyond EventForm and PocketBase RSVP

[haljac]

Summary

Test coverage is limited to two files:

• src/components/EventForm.test.tsx — 50+ tests
• src/lib/pocketbase.test.ts — RSVP function tests

Components Without Tests

High priority (interactive, stateful):

• LoginForm.tsx — Authentication form
• RegisterForm.tsx — Registration form
• AccountDashboard.tsx — Account management
• Header.tsx — Navigation with mobile menu and auth state
• ScheduleEvents.tsx — Dynamic event schedule

Medium priority:

• Newsletter.tsx — Form submission
• Hero.tsx — CTA links
• Footer.tsx — Navigation links

Acceptance Criteria

• LoginForm has tests for login flow, validation, and error states
• RegisterForm has tests for registration, validation, and error states
• Header has tests for navigation and mobile menu toggle
• ScheduleEvents has tests for event display and loading states
• Test coverage report shows meaningful improvement