Detailed Description
Mirrors `NodeIdentityActivity` on the sentient axis: hosts a `PortableSentientIDWidget` rendering the active sentient's portable form (via `HiveSession::activeSentientPortable()`), plus Assets and Log out buttons.
Back-door (§IS-P2-3): push the activity with a `psid:1:...` string as first arg to render that sentient identity instead of the active one. Wrong-prefix input is rejected; the activity falls back to the active identity.
