Phase 2 | Priority: P0 | Status: Not Started | Covers: FR-002, FR-005

Objective

Build the UI component that displays the referral code and link with a one-click copy button.

Acceptance Criteria

• Displays referral code prominently + full shareable link
• Copy button copies link to clipboard; shows confirmation toast
• Fires referral_link_shared event with share_method: 'copy'
• Graceful fallback if clipboard API unavailable

Dependencies

Depends on: Invite Friends page shell. Blocks: nothing.