feat(IAV-1227): Refactor users section with role-based pill toggle and UI cleanup

Summary

• Replace the role dropdown in the "Add User" modal with a pill toggle switch (Super Admin / Client Marchand)
• Add a role filter pill toggle above the users table to switch between Super Admin and Client Marchand views
• Remove the Rôle column from the users data table
• Remove the delete action from user rows (keep edit and status toggle only)
• Rename UserRole.USER to UserRole.COLLABORATOR, then remove it entirely as it's no longer needed
• Update role labels: Admin → Client Marchand
• Clean up dead code: unused props (onView, onSettings, onDelete), delete confirm dialog, and handlers
• Set default pagination to 4 items per page with options [4, 8, 12]
• Expand mock data to 11 users (6 Super Admin, 5 Client Marchand)

Changes

• src/types/user.ts — Remove COLLABORATOR from UserRole enum
• src/types/data-table.ts — Add limitOptions to DataTablePagination
• src/shared/sections/users/view.tsx — Add role pill toggle, remove dead handlers, update pagination
• src/shared/sections/users/components/add-user-modal.tsx — Replace role dropdown with pill toggle
• src/shared/sections/users/components/users-list.tsx — Remove role column, delete action, and dead props
• src/shared/sections/users/styles.ts — Update role labels and badge styles
• src/shared/components/ui/data-table/index.tsx — Pass limitOptions to PaginationFooter
• src/shared/_mock/user.ts — Update mock data (11 users, no collaborators)

Closes IAV-1227