* test(e2e): cover Team Admin view + member + key flows
Adds a new spec exercising the previously-uncovered team-admin manual-QA
items: viewing all team keys (including other members'), adding a member,
removing a member, and creating a team key with All Team Models. Also
seeds a dedicated invitee user so the add-member test can run in parallel
with the proxy-admin invite test without colliding on the team roster.
* test(e2e): harden team-admin member specs per review feedback
Address Greptile feedback on the Team Admin spec:
- locate the delete action via getByTestId("delete-member") instead of
the fragile svg/img .last() selector
- match the seeded removable member by user_id (members_with_roles stores
no email, so the roster renders user_id)
- assert exact success-toast strings rather than broad regexes that could
match unrelated "success" text
