[Bug] Farm workers can modify task assignments despite "view-only" role

[rmsonge]

Users with the worker role can reassign tasks to others even when their permissions are set to view-only in the admin panel.

Steps to Reproduce:

1. Assign worker role to UserA with view-only tasks permission.
2. As UserA, navigate to Tasks → Reassign a task to UserB.
3. Observe successful reassignment.

Expected Behavior:

• Reassignment button should be disabled/hidden for view-only users.

Actual Behavior:

• Silent permission bypass.

Environment:

• Tania Core: v1.6.2 (Community Edition)
• Auth: JWT

Evidence:

// API Response (should fail with 403)  
{"status": "success", "message": "Task reassigned"}