Provider column sorting in users admin table does not work

[babs20]

Details

• Component: admin-users.vue
• Issue Location: v-data-table headers configuration
• Root Cause: Property name mismatch between table header value ('provider') and data source property ('providerKey')

Steps to Reproduce

1. Navigate to Admin > Users
2. Click on the Provider column header
3. Observe that the table does not sort by provider

Expected Behavior

• Table should sort entries by provider when clicking the Provider column header

Current Behavior

• Clicking the Provider column header has no effect on sorting

Fix

Update the header configuration to use 'providerKey' instead of 'provider' as the value property.