Refactor availability screen components

[SanjayaGrg]

Summary

Refactored AvailabilityScreen by separating reusable UI sections into smaller components while keeping the existing behavior the same.

What was done

• extracted AvailabilityViewToggle into a separate reusable component
• extracted AvailabilitySimpleView into a separate reusable component
• extracted AvailabilityWeeklyView into a separate reusable component
• extracted AvailabilityMonthlyView into a separate reusable component
• extracted AvailabilityCalendarModal into a separate reusable component
• cleaned up AvailabilityScreen.tsx by removing large inline UI blocks
• kept availability state, API calls, helper logic, and navigation logic inside AvailabilityScreen
• preserved the original screen flow and functionality after refactoring

Why

AvailabilityScreen.tsx had become too large and was handling too many UI responsibilities in a single file. This refactor improves:

• readability
• maintainability
• reusability
• easier debugging
• easier future updates without changing business logic

Files added

• src/components/toggle/AvailabilityViewToggle.tsx
• src/components/view/AvailabilitySimpleView.tsx
• src/components/view/AvailabilityWeeklyView.tsx
• src/components/view/AvailabilityMonthlyView.tsx
• src/components/calendar/AvailabilityCalendarModal.tsx

Files updated

• src/screen/AvailabilityScreen.tsx

Notes

• no intended behavior changes
• refactor focused on UI/component separation only
• screen logic and availability persistence remain in the main screen

Screenshots: