Performance Optimizations

This PR implements multiple mobile performance improvements:

1. Route-Level Code Splitting ✂️

• Converted all route components to lazy loading (Home, Login, Landing)
• Previously only some routes were lazy-loaded
• Result: Smaller initial bundle, faster first paint

2. Component Memoization 🧠

• Added React.memo() to ListCard and ListItem components
• These components are rendered in lists and benefit from memoization
• Result: Prevents unnecessary re-renders when parent components update

3. Image Lazy Loading 🖼️

• Added loading="lazy" attribute to images in Attachments component
• Result: Reduced bandwidth usage, faster page load

Build Analysis 📊

After optimization, chunk sizes are:

• Home: 38.64 kB (gzip: 9.11 kB)
• Login: 5.45 kB (gzip: 2.18 kB)
• Landing: 7.60 kB (gzip: 2.38 kB)
• ListView: 58.75 kB (gzip: 14.41 kB)

All routes are now code-split effectively!

Testing ✅

• Build passes
• All optimizations verified in build output
• No functionality changes - pure performance improvements