feat(admin): add staff filter to users list

[trtajim]

Description

This PR adds a filter to the admin users management page (/admin/users) to easily view staff members vs all users.

Summary of Changes:

• Backend Controller (UserController.php):
  • Added role filtering logic in index method (staff, student, or specific roles like admin, editor, manager).
  • Added user counts (all, staff) in Inertia response props.
  • Preserved query parameters across pagination via withQueryString().
• Frontend UI (Index.vue):
  • Added segmented toggle buttons (All vs Staff Only) with live user count badges.
  • Linked search and role filter parameters seamlessly.
  • Added an empty state for when no staff users are found.
• Tests (AdminUserListFilterTest.php):
  • Added automated feature tests covering default listing, staff filtering, and combined search + staff filter.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 3880da6 and d350f65.

📒 Files selected for processing (4)

• .coderabbit.yaml
• app/Http/Controllers/Admin/UserController.php
• resources/js/pages/admin/users/Index.vue
• tests/Feature/AdminUserListFilterTest.php

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