#60 Add copy button for contract ID

[karanjadavi]

Description:

Problem
Users need to manually select and copy the contract ID to use it elsewhere. This is inconvenient and error prone.
Solution
Add a copy to clipboard button next to the contract ID displayed on the frontend.
Tasks

Add contract ID display section to frontend
Add copy to clipboard button
Show checkmark confirmation after copying
Test on mobile and desktop browsers

Skills needed
TypeScript, Next.js
Difficulty
Easy