[A11y] [VPAT] 2.4.3 Focus Order - Focus does not advance to side panel for Read Mode

[dave-gus]

Description:
User cannot navigate side panel in Read Mode. Focus has not advanced to the side panel. User must first tab to an actionable item in the side panel and then use arrow keys to "read" the content, but readable content has been skipped when tabbing to the first actionable item so a blind screen reader user has missed the header and the top of the side panel.

Steps to Reproduce:

Create a Search project and go to the Search project homepage (ex: https://my-elasticsearch-project-eca3d1.kb.eu-west-1.aws.qa.elastic.cloud/app/elasticsearch)

In left nav, select 'Playground'
Under 'Connect to LLM', select 'Connect' to open side panel
Use arrow keys to advance through the side panel in Read Mode

WCAG or Vendor Guidance (optional)

• Understanding SC 2.4.3 Focus Order (Level A)

[daveyholler]

@radhapolisetty I've added this to the Search Experiences team project

[yansavitski]

@daveyholler Created a bug for EUI team as flyout focus was broken after updating navigation in Kibana and ES3, with new EuiCollabsableNavBeta

[yansavitski]

Should be fixed here