Enhancement: Improve share UX for iOS and Android

[renderghost]

Description

Enhance profile sharing to follow iOS and Android native sharing conventions and improve mobile UX.

Current Issues

• Generic web sharing may not feel native on mobile
• Missing platform-specific share features
• Could better leverage mobile OS capabilities

Proposed Improvements

iOS

• Use Web Share API with fallback
• Support iOS share sheet integration
• Add to Home Screen prompt for PWA
• Share with proper preview (Open Graph)

Android

• Web Share API support
• Android share sheet integration
• Install banner for PWA
• Proper share target registration

Cross-Platform

• Copy link button with toast confirmation
• QR code for easy profile sharing (already implemented)
• Share via email/SMS/social apps
• Share text includes profile name and URL

Implementation

1. Detect platform (iOS/Android/Desktop)
2. Use Web Share API where supported:

   navigator.share({
     title: 'Name - Lanyards',
     text: 'Check out my research profile',
     url: window.location.href
   })

3. Fallback to custom share modal
4. Add native-feeling animations and feedback

Benefits

• Better mobile user experience
• Increased profile sharing
• Platform-appropriate behavior
• More engagement and discovery