Add Weekday Range Select

[mirmirmirr]

• Added logic to support selecting a range of weekdays by clicking the start and end days, including state management for range selection in weekday-calendar.tsx.
• Refined the UI for weekday selection buttons, increasing their size and improving selected/unselected styling for better user experience in weekday-calendar.tsx.

Why

Because the backend is structured to take only a weekday range

[Copilot]

Pull Request Overview

This PR implements weekday range selection functionality to support backend requirements for weekday ranges. The changes enable users to select a continuous range of weekdays by clicking start and end days, replacing individual day selection.

• Added range selection state management with startDay state variable
• Implemented handleRangeSelect function to manage range selection logic
• Enhanced UI styling for weekday buttons with improved sizing and selected state appearance

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
app/ui/components/weekday-calendar.tsx	Added range selection logic, improved button styling, and updated type imports
app/_lib/schedule/types.tsx	Extracted Weekday type for better type reusability

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[jzgom067]

👍