Profile skeleton with edit functionality

## Acceptance Criteria
- Show name/email/role from /users/me
- Edit modal → PUT /users/me → toast success
- Add empty state + "Create Runner" button

## Test Notes
- Profile loads and saves cleanly
- User data displays correctly from API
- Edit functionality works with proper validation
- Toast notifications show success/error states

Start by locating the profile view and the /users/me API integration. Trace how profile data is loaded, then inspect the existing modal, validation, empty-state, and toast patterns before making changes. Done means the name, email, and role display correctly, editing saves through PUT /users/me, the Create Runner empty state appears, and success or error feedback is shown.

Written by the indexing model from the issue text.