Fix: Create SearchAccess on library creation for course creator search access

[Waleed-Mujahid]

Problem

When a course creator (non-superuser) creates a new content library and immediately tries to add components, the UI doesn't update to show the newly added component in search results. This happens because:

1. Meilisearch uses JWT tokens with access_id filters to restrict search results to libraries/courses the user has permission to access
2. The JWT token is cached in the frontend for 1 hour
3. SearchAccess records were only created during document indexing (in _meili_access_id_from_context_key)
4. For a newly created empty library with no components yet, no SearchAccess record exists
5. When the user adds the first component, their cached JWT doesn't include the new library's access_id, so Meilisearch filters it out

Solution

Create the SearchAccess record immediately when a library is created in the content_library_created_handler. This ensures:

• The SearchAccess record exists before any components are added
• Course creators who create a library can immediately search its content
• The frontend can refresh the JWT token after library creation to get the updated access_id

Testing Instructions

Prerequisites

• Have a course creator user (non-superuser with library creation permissions)
• Have Meilisearch enabled and configured
• Have the corresponding frontend fix deployed (see related PR)

Manual Testing

1. Login as the course creator and navigate to Studio
2. Create a new library
3. Add a new component
4. Notice how the the UI does not update.
5. Reload page, the UI should show the component was added
6. After applying the fix the component will render as soon as it is added

Authoring MFE PR

Refreshes JWT token after library creation

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