[Accessibility]: Notepad: Relevant action buttons are not focused when activating "Remove all notes" button

Created by: fkling

Audit type

Keyboard navigation

User journey audit issue

https://github.com/sourcegraph/sourcegraph/issues/34198

Problem description

1. Enable notepad by going to https://sourcegraph.com/notebooks and click the "Enable Notepad" button (notepad should be visible in the bottom right corner).
2. Perform a search on https://sourcegraph.com/search that yields a non-trivial amount of search results.
3. Add at least one entry to the notepad
4. Focus and active the "Remove all notes" button

At this point the confirmation panel shows up but the focus is still on the "Remote all notes" button, which means the user has to Shift+Tab to the "Cancel" and "Yes, delete" buttons (and focusing "over" the "Create Notebook" button in that process).

Expected behavior

Focus the "Cancel" button when the panel shows up, so that that action can be activated directly, and "Delete all" can be activated after a single tab.

Additional details

No response

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Owner

This issue will be fixed by my team, I have assigned a relevant member to it, or I will do so in the near future.