Implement cascading deletion of user roles and edits with project visibility

[Copilot]

Implement cascading deletion of user roles and edits with project visibility

Backend Changes

• UserController: Enhanced DeleteUser to cascade delete all associated UserRole and UserEdit records. Added validation to prevent admin user deletion (returns 403).
• New endpoint: GetUserProjects returns project info and roles for deletion confirmation.
• UserProjectInfo DTO: Simple model containing projectId, projectName, and role.

// Cascade deletion implementation
foreach (var (projectId, userEditId) in user.WorkedProjects)
    await _userEditRepo.Delete(projectId, userEditId);
foreach (var (projectId, userRoleId) in user.ProjectRoles)
    await _userRoleRepo.Delete(projectId, userRoleId);

Tests

Added 5 test cases covering:

• Cascading deletion of roles and edits
• Admin user deletion prevention
• Project listing endpoint (happy path, auth, not found)

Frontend Changes

• ConfirmDeletion dialog: Fetches and displays user's project memberships with roles before deletion. Shows error state with red text and disables Delete button if project info fails to load.
• backend/index.ts: Added getUserProjects() function.

Screenshots

User without projects

User with lots of projects, some archived

Roles translated for UI language

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This change is 

[github-actions]

⚠️ Commit Message Format Issues ⚠️
commit c84025e3c1:
1: T1 Title exceeds max length (74>72): "Add frontend support for displaying user projects in deletion confirmation"

[codecov]

Codecov Report

❌ Patch coverage is 77.27273% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.66%. Comparing base (ede2527) to head (e60818e).
⚠️ Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
...ts/SiteSettings/UserManagement/ConfirmDeletion.tsx	0.00%	14 Missing ⚠️
Backend/Controllers/UserController.cs	97.91%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3971      +/-   ##
==========================================
+ Coverage   74.58%   74.66%   +0.07%     
==========================================
  Files         293      293              
  Lines       10817    10890      +73     
  Branches     1353     1364      +11     
==========================================
+ Hits         8068     8131      +63     
- Misses       2354     2362       +8     
- Partials      395      397       +2     

Flag	Coverage Δ
backend	85.66% <98.07%> (+0.20%)	⬆️
frontend	66.11% <0.00%> (-0.12%)	⬇️

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[imnasnainaec]

@imnasnainaec reviewed all commit messages.
Reviewable status: 0 of 15 files reviewed, all discussions resolved (waiting on @copilot)

[jasonleenaylor]

Failing to get user info should fail the contents.

@jasonleenaylor reviewed 2 of 5 files at r2, 12 of 13 files at r3, all commit messages.
Reviewable status: 14 of 15 files reviewed, all discussions resolved (waiting on @copilot and @imnasnainaec)

[Copilot]

Failing to get user info should fail the contents.

@jasonleenaylor reviewed 2 of 5 files at r2, 12 of 13 files at r3, all commit messages....

Fixed in e7d9591. When getUserProjects fails, the dialog now:

• Sets a loadFailed state flag
• Displays an error message in red ("Failed to load user projects...")
• Keeps the Delete button disabled
• Shows an error toast instead of a warning

Previously, the catch block only logged and showed a warning toast, leaving projInfo as undefined which caused the UI to show "Loading..." indefinitely while the button remained disabled without clear indication of the error state.