feat: make mobile apps a first-class landing page experience

[eastlight2]

Summary

Refreshes the Gibwork landing page to make its mobile apps and onchain work experience immediately visible.

What changed

• Repositioned the hero around instant onchain work and payments.
• Added a dedicated iOS and Android section with official store links.
• Added responsive mobile app previews for task discovery, submissions, reviews, and earnings.
• Expanded task messaging beyond development to design, content, research, feedback, and community work.
• Added mobile app navigation links and updated site metadata.
• Fixed narrow-screen overflow in the hero, partner logo marquee, and testimonial carousel.

Why

The current landing page does not clearly surface Gibwork's mobile apps or explain the smart-contract escrow and onchain settlement experience. These changes make the product value clearer for both task creators and contributors, especially on mobile.

Validation

• npm run build
• Reviewed responsive layout behavior across mobile and desktop breakpoints.
• Verified the official App Store and Google Play destinations.

[vercel]

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