introduce fun fact toast message with proper styling

[DevxNadeem]

📘 Pull Request – Add Fun Fact Toast

🔍 Description

This PR introduces a Fun Fact toast/card to the simulation pages. Each simulation now displays a short, relevant physics fact to improve the educational experience.

Changes made

• Added a reusable Funfact component.
• Added a dataset containing simulation-specific physics facts.
• Integrated the component into TopSim.
• Designed a responsive UI matching the existing PhysicsHub theme.
• Added a dismiss (✕) button.
• Automatically hides the toast after a few seconds.

Closes #12

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✅ Checklist

• Verified that the project builds and runs locally (npm run dev)
• Ensured no ESLint or TypeScript warnings/errors remain
• Updated documentation/comments where needed
• Verified responsiveness across devices
• Followed the CONTRIBUTING.md guidelines

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🎨 Visual Changes

• Added a floating Fun Fact card to simulation pages.
• Added a close button to dismiss the card.
• Styled the component to match PhysicsHub's existing UI.
• Included support for both light and dark themes.

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📂 Type of Change

• 🐛 Bug fix
• ✨ New feature
• 💥 Breaking change
• 📝 Documentation update
• ♻️ Refactor / code quality improvement
• 🎨 UI/UX enhancement
• 🔒 Security improvement

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🧩 Additional Notes for Reviewers

• The Fun Fact card is displayed only on simulation pages.
• Facts are mapped to simulations using their chapterId.
• The component is reusable and can be extended by adding new entries to the facts data file.
• The card automatically disappears after a short delay and can also be dismissed manually using the close button.

[vercel]

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[mattqdev]

Thank you for this PR!

[physicshub]

🎉 This PR is included in version 3.29.0 🎉

The release is available on GitHub release

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