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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Lighthouse	7 paths audited Performance: 48 (🔴 down 5 from production) Accessibility: 93 (no change from production) Best Practices: 89 (🔴 down 9 from production) SEO: 92 (no change from production) PWA: - View the detailed breakdown and full score reports

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[pettinarip]

Great @Sambit03! lgtm

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