- Find Edit buttons directly instead of looking for td.actions
- Inject button before each Edit User button found
- Works with JupyterHub React admin panel structure
- Walks up DOM to find user container and extract username
- Find username via multiple methods (admin link, server link, text)
- Copy exact class from Edit button for consistent styling
- Insert button before Edit button (between server actions and edit)
- Works for all users, not just those with running servers
- Admin panel shows spinner with "Deleting user {username}..." during deletion
- Refactored loading modal to accept dynamic message text
- New users get initial activity sample recorded automatically
- New users show 0% activity bar instead of '--' in Activity Monitor