feat: make mobile apps a first-class landing path

[qtcqtc]

Summary

• refreshes the hero around the current paid-task and onchain-payout workflow
• adds a responsive mobile-app section with a compact product-flow preview
• links the live iOS and Android listings with accessible store CTAs
• adds mobile-app discovery metadata (apple-itunes-app, manifest metadata, and MobileApplication JSON-LD)
• adds desktop/mobile navigation paths and labels the approval requirement for payouts

Why

The current landing page describes a generic talent marketplace and gives the mobile apps no first-class path. This change makes the product promise concrete without implying that payouts happen before a creator approves a submission. It also gives visitors and search clients verifiable routes to both official app listings.

Verification

• npm run build
• npx tsc --noEmit
• git diff --check
• manual desktop viewport review
• manual 390 × 844 mobile viewport and navigation review
• App Store and Google Play URLs both return HTTP 200

This implements the landing-page/mobile-app enhancement requested by the active Gibwork task.

[vercel]

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