feat: add temporary message alert in sections settings tab in libraries

[navinkarkera]

Description

Also increase sidebar width to remove More option and display all tabs
together

Supporting information

• Section/subsection settings #1976 (comment)

Testing instructions

Verify the alert message in settings tab of sections sidebar in library.

Other information

Include anything else that will help reviewers and consumers understand the change.

• Does this change depend on other changes elsewhere?
• Any special concerns or limitations? For example: deprecations, migrations, security, or accessibility.

Best Practices Checklist

We're trying to move away from some deprecated patterns in this codebase. Please
check if your PR meets these recommendations before asking for a review:

• Any new files are using TypeScript (.ts, .tsx).
• Avoid propTypes and defaultProps in any new or modified code.
• Tests should use the helpers in src/testUtils.tsx (specifically initializeMocks)
• Do not add new fields to the Redux state/store. Use React Context to share state among multiple components.
• Use React Query to load data from REST APIs. See any apiHooks.ts in this repo for examples.
• All new i18n messages in messages.ts files have a description for translators to use.
• Avoid using ../ in import paths. To import from parent folders, use @src, e.g. import { initializeMocks } from '@src/testUtils'; instead of from '../../../../testUtils'

[openedx-webhooks]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.90%. Comparing base (42acb53) to head (52ff936).
⚠️ Report is 7 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #2734    +/-   ##
========================================
  Coverage   94.90%   94.90%            
========================================
  Files        1235     1235            
  Lines       28260    28260            
  Branches     6433     6227   -206     
========================================
  Hits        26819    26819            
- Misses       1370     1383    +13     
+ Partials       71       58    -13     

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[ChrisChV]

Looks good 👍

• I tested this: I followed the testing insturctions
• I read through the code and considered the security, stability and performance implications of the changes.
• I tested that the UI can be used with a keyboard only (tab order, keyboard controls).
• Includes tests for bugfixes and/or features added.

[ChrisChV]

@navinkarkera merged, Is this a fix that needs to be backported?

[navinkarkera]

@ChrisChV Created: #2766