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

Objective

Build a modal that lets users share their referral link via email with a pre-filled message template.

Acceptance Criteria

• Modal triggered from "Share via email" button on Invite Friends page
• Pre-filled subject + body with referral link embedded
• Opens user's default email client (mailto: link)
• Fires referral_link_shared event with share_method: 'email'
• User can edit message before sending

Dependencies

Depends on: Invite Friends page. Blocks: nothing.