feat(explorer): As a user, I want the Portal page to display links to the Portal contract and owner addresses

[Chirag-S-Kotian]

What does this PR do?

Description

Enhances the Portal page by converting static addresses into clickable blockchain explorer links, improving user experience and accessibility.

Changes

• Added clickable blockchain explorer links for Portal contract address
• Added clickable blockchain explorer links for Portal owner address
• Integrated external link indicators using ArrowUpRight icon
• Preserved ENS name display functionality for owner addresses
• Maintained consistent styling with the existing UI

Implementation Details

• Utilized getBlockExplorerLink utility to generate network-specific explorer URLs
• Added conditional link rendering based on chain availability
• Implemented external link styling with hover effects
• Added visual indicators for external links

Testing

• Verified links work correctly across different networks
• Confirmed ENS name display remains functional
• Tested fallback behavior when chain explorer is unavailable

Related ticket

Fixes #782

Type of change

• Chore
• Bug fix
• New feature
• Documentation update

Check list

• Unit tests for any smart contract change
• Contracts and functions are documented