Role is still auto-pulled from the employee's Default Role on the
employee profile (planning.slot._compute_role_id reads
resource_id.default_role_id). Hiding the manual Role field declutters
the Add Shift dialog so the manager doesn't have to think about it on
each shift.
If a shift needs a one-off role override, an admin can still set it
via the backend list view or by editing the resource's default role.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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