Enable team résumé collaboration (e.g. job coaching)

[saviobatista]

Business Value
Collaboration allows users to work with mentors, coaches, or colleagues to fine-tune résumés before applying — improving quality and confidence.

Description
Allow users to share access to specific résumé sessions with others. Enable viewing, commenting, and limited editing.

Technical Details

• Requires user accounts
• Store shared session IDs and permissions
• Build /app/collaborate/[id] page
• Optional comment mode (readonly + discussion)

Acceptance Criteria

• Users can share résumé sessions securely via link or email
• Collaborators can view and optionally comment
• Permissions respected for edit vs read-only access