(core) Polish Access Details

Summary:
Instead of showing a blank dialog for users whose access
is limited (e.g. public members), we now show the user's
role and a mention of whether their access is public.

Test Plan: Browser tests.

Reviewers: paulfitz

Reviewed By: paulfitz

Differential Revision: https://phab.getgrist.com/D3431

app/common/UserAPI.ts

@@ -152,7 +152,10 @@ export interface PermissionDelta {
 }
 
 export interface PermissionData {
-  personal?: boolean;
+  // True if permission data is restricted to current user.
+  personal?: true;
+  // True if current user is a public member.
+  public?: boolean;
   maxInheritedRole?: roles.BasicRole|null;
   users: UserAccessData[];
 }