Add "Share Board" button to copy board URL 🔗

[anoopcodehack]

Add "Share Board" button to copy board URL 🔗

File: client/src/pages/Dashboard.jsx

No way to quickly share the board
link with teammates 💀 fr!!

Fix: add share button in navbar:
const handleShare = () => {
navigator.clipboard.writeText(window.location.href)
setShared(true)
setTimeout(() => setShared(false), 2000)
}

{shared ? '✅ Copied!' : '🔗 Share'}

~8 lines! No backend needed 🎯
super useful for teams!! 🔥

[sudarshan-murade]

Hi! I'd like to work on this issue. I can implement the Share Board button in Dashboard.jsx with clipboard functionality and the copied confirmation state.