Fix dead footer links and standardize internal navigation

[ianujvarshney]

The footer contains several href="#" placeholders and mixes raw <a> tags with next/link for internal routes. This causes dead clicks, inconsistent routing behavior, and a weaker user experience.

Expected

• Replace internal anchors with Link
• Remove or replace # links
• Add missing legal pages or hide them until they exist

Acceptance criteria

• No dead footer links remain
• Internal navigation uses Link
• Missing pages are either implemented or not displayed