The T19/T20 catch blocks looked for an `.body` property on thrown errors
to extract the structured error code. The shared API client (api/client.ts:298)
actually throws `new Error(body.error)` — the code lives in `err.message`,
and there's no `.body` attached.
Live E2E (T22 scenario 2) caught this: typing alice@orbit against an
awaiting_approval peer surfaced the raw code 'peer_pending_approval' as
the toast text instead of the human-readable mapServerErrorToMessage
output. Same defect would have hit every server-error toast on both
FriendsPage (AddFriend + UserDiscoverCard) and UserProfileModal.
Catch blocks now use err.message as both the code and the fallback text;
the inline comment points at the API client throw site so the contract
is documented at the consumer.
Jannis Braun
fe969a7d96