fix: make quotes on homepage clickable to their sources

[hturnbull93]

Closes #681

Summary

• Adds an optional href field to the CarouselQuote type
• Wraps quote cards in an <a> tag when a source URL is available, otherwise renders as a plain <div> (no behaviour change for quotes without a source)
• Adds source URLs for ASI Statement, CAIS Statement, and Stephen Hawking quotes (sourced from existing data.json)
• Styles the link to inherit colour and remove underline so the card appearance is unchanged

🤖 Generated with Claude Code

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[Wituareard]

Currently there's a way to navigate the quotes like social media stories by tapping on the sides. Not sure if it's super necessary but this interferes with it. So maybe the link should only be on the name or something for now

[Pato-desu]

Currently there's a way to navigate the quotes like social media stories by tapping on the sides. Not sure if it's super necessary but this interferes with it. So maybe the link should only be on the name or something for now

I don't think people would want to move through the quotes tapping on the sides, the arrows already exist, it's unintuitive.

[Pato-desu]

If you agree Nils I would just merge

[Wituareard]

Alright yeah feel free, let's also remove the interactive elements soon then (separately)