Keyboard support for dragging special characters dialog

[jmegginson]

📝 Provide detailed reproduction steps (if any)

There is no accessibility documentation to move the special characters dialog with the keyboard

1. open accessibility help (alt+0)
2. observe no directions to move or drag the dialog with only the keyboard

✔️ Expected result

As a keyboard user I would expect some kind of focus or keyboard indication that a non-modal window like special characters can be moved so rich text content is not obscured by the dialog.

❌ Actual result

There is no documented keystroke to move this dialog with the keyboard. Sighted keyboard-only users must close the special characters dialog if it obscures text while opened.

❓ Possible solution

At a minimum navigate to the parent container (that contains the ARIA role=dialog) and move the dialog container with the keyboard

📃 Other details

tested with CKEditor5 v44.2.0
Browser: Chrome and Safari
OS: Windows 10 and MacOS v13
First affected CKEditor version: the version that changed the special characters from a dropdown component to a non-modal dialog

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