fix(ulmo): backport changing how the feedback message is displayed for adding team members

[jacobo-dominguez-wgu]

Description

Backport for #42

This PR is intended to improve the feedback process and have a better feedback system for user's input in the add team member modal.
Closes #14.

What it changes:

• Improved Toast Feedback System
  Before: Single generic toast message for all scenarios
  After: Separate toast messages for each status type:
  ✅ Successfully added users
  ❌ User already has the assigned role
  ❌ User not found
  ❌ Generic errors
  This provides clearer, more actionable feedback to users.

• Enhanced Message Clarity
  Added user identification: Toast messages now include the specific userId that triggered each status
  Example: The user already has the role ([email protected])
  Benefit: Users can easily identify which specific user caused each message when multiple toasts are displayed

• Visual Error Indicators
  Extended red text functionality: Previously only "user not found" errors showed red text in the input textarea
  Now applies to all error types: Any user causing an error will appear in red in the textarea
  Improved UX: Users can quickly identify problematic entries and fix them

• Better Error Handling Flow
  Modal behavior: The "Add Team Member" modal no longer auto-closes when errors occur
  Why: Allows users to immediately correct typos or invalid entries without reopening the modal
  Result: Smoother error recovery workflow

• Dynamic Toast Duration
  Adaptive timing: Toast display duration now scales with the number of messages
  Formula: 5 seconds × number of toast messages displayed
  Rationale: Gives users adequate time to read multiple concurrent messages (up to 4 different toast types)

Demo video

Grabacion.de.pantalla.2025-11-20.a.la.s.4.08.25.p.m.mov

How to test it

• npm install && npm run dev
• Go to http://apps.local.openedx.io:2025/admin-console/authz/libraries/<YOUR_LIB_ID>
• Click on the add team member button to continue with the following scenarios:

We can test all the error cases described here, but also the next case scenarios covers most of the error and success cases:

Test scenario 1 (success)

Add a role to an existing user which role is not already set.
Expected: It should show the success toast message for 5 seconds and the modal automatically closes.

Test scenario 2 (already set error)

Add a role to an existing user which role is already set.
Expected: It should show the already set toast message for 5 seconds and the modal does not close.

Test scenario 3 (two usernames, one successful and one error)

Type the username of an existing user and one nonexisting and asign a role not already set.
Expected: It should show the success toast message and the non existing user message for 10 seconds. The modal does not closes and the username of the nonexisting and input text area should be in error state.

Test scenario 4 (three usernames, one successful and two errors)

Type the username of an existing user, one nonexisting user and one existing user with a role asigned (user3), asign the role of the user 3.
Expected: It should show the success toast message, the non existing user message and the already set role error message for 15 seconds. The modal does not closes and the usernames of the nonexisting user and the already set user should be in error state.

[openedx-webhooks]

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✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

@@               Coverage Diff               @@
##             release/ulmo      #44   +/-   ##
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  Coverage                ?   94.95%           
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  Files                   ?       44           
  Lines                   ?      912           
  Branches                ?      155           
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  Hits                    ?      866           
  Misses                  ?       44           
  Partials                ?        2           

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[dcoa]

@jacobo-dominguez-wgu could you please update this, so I can merge? I think there is a change that is not integrated here compared with the master version.

[jacobo-dominguez-wgu]

@jacobo-dominguez-wgu could you please update this, so I can merge? I think there is a change that is not integrated here compared with the master version

It is updated now to include the same changes as the master version.