Manage access labels grantees as Objectobject ([object Object]) #164

From UI testing on main after #163.

flybot/social/access (Manage access) shows every grantee as @objectobject / Objectobject (@objectobject).

Root cause (observed): the view helper stringifies an object-shaped grantee with String(grantee), which becomes [object Object] and then gets cleaned into Objectobject.

Expected: show handle / display name from the grantee object fields returned by Bot Social.

Regression test: pass an object-shaped grantee and assert the label is not Objectobject.