Migrate Translatathon/TranslatathonCalendar.tsx to Shadcn/Tailwind

[Sambit03]

Migrate Translatathon/TranslatathonCalendar.tsx to Shadcn UI and Tailwind CSS

Description

• This PR migrates TranslatathonCalendar.tsx to Shadcn UI and Tailwind CSS, replacing Chakra UI imports with native tags and Shadcn components.

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