refactor(authz): display team members information agregated in the table

[dcoa]

Context

The Team Members tab renders one row per role assignment. The new design regroups it into one row per user, with that user's assignments nested underneath an expandable row.

Important

It follows the API contract defined in openedx-authz. It needs the backend implementation here openedx/openedx-authz#451

Changes summary

Data

• The Team Members table now uses the user-grouped endpoint GET /api/authz/v1/users/ instead of /assignments/.
• Added TeamMember and TeamMemberAssignment types that match the API.

Team Members table

• One row per user: username (with "(Me)" for the current user), email, their first role shown as "Role in Scope", a "+N more roles" toggle, and the View action.
• The toggle opens a breakdown card: Role / Scope / Organization, "Showing X of Y", and "View all roles".
• Only one row can be expanded at a time, via the new shared useExclusiveRowExpansion hook.
• Styling: more row spacing, fixed column widths only from md up (the table scrolls on small screens), the breakdown header matches the Roles & Permissions category rows, and icons use the primary color.

Shared

• The user page (audit table) shows "All courses" / "All libraries" and "All platform" for org-wide and platform-wide roles.
• The "All Organizations" label now says "All platform" to match the Team Members table.
• ViewMoreLink is now a button instead of a link. Making the action accessible.
• The scope icon now comes from the scope key instead of the role. New helpers getAggregateScopeType and getScopeContextType detect org-wide and platform-wide scopes.

Errors & permissions

• The home page waits for the permission check, then shows 403 Access Denied if the user can't view course or library teams.
• The table shows one toast per failed request, instead of two.
• The loading spinner now announces itself to screen readers (role="status" and a label).

Testing instructions

1. Make sure to use the backend implementation specified above.
2. Add uses with different roles and add different roles to a user. Make sure you have users with:
   • a single role
   • more than 3 roles
   • an org-wide role (e.g. course-v1:MyOrg+*)
   • a platform-wide role (e.g. course-v1:* or lib:*)

In Team Members tab

1. There is one row per user, showing username, email and their first assigned role.
2. Users with more than one role show "+N more roles". Clicking it opens the role breakdown, and only one breakdown can be open at a time.
3. The breakdown footer shows "Showing X of Y". "View all roles" appears when not all roles are listed, and opens the user's page.
4. An org-wide role shows the org name in the row, and "All courses" / "All libraries" in the breakdown.
5. A platform-wide role shows "All platform" with a globe icon in the row and in the breakdown's Organization column.
6. The Organization, Role, Scope and search filters narrow the list, and the "Showing N users of M." count updates.

In User audit page
7. Org-wide and platform-wide roles show "All courses" / "All libraries" and "All platform".

Edge cases
8. A user with no team view permission sees the 403 Access Denied page.

Additional information

Closes openedx/openedx-authz#407
Closes #174
Address #156

Supported by claude

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[codecov]

Codecov Report

❌ Patch coverage is 99.55947% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 97.91%. Comparing base (36cc825) to head (339d753).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/authz-module/data/hooks.ts	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #222      +/-   ##
==========================================
+ Coverage   97.65%   97.91%   +0.25%     
==========================================
  Files          68       76       +8     
  Lines        1665     1819     +154     
  Branches      443      451       +8     
==========================================
+ Hits         1626     1781     +155     
+ Misses         39       38       -1     

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