- Add Dashboard as first sidebar nav item under Overview section
- Update /manage page to render DashboardOverview instead of redirecting
- Remove redirect to /manage/users
- Wrap table in overflow-x-auto container with min-w-[800px] to prevent overflow on smaller screens
- Add hard delete (purge) button to actions column for each benchmark entry
- Add confirmation dialog for permanent deletion with warning
- Add handleHardDelete handler that calls DELETE /api/admin/performance/:id/hard-delete
- Add DELETE endpoint for hard-deleting performance entries from the database
- Expand confirmAction state type to include 'hardDelete'