The demo was rewritten from an editor+confirm-modal to a streaming
document viewer, but the tests still expected the old UI elements
(textarea, confirm-changes-modal, reject/confirm buttons, status
display). Rewrite tests to match the actual DocumentView component:
document-view panel, document-content, char-count, live badge, and
CopilotSidebar with suggestions.
The showcase framework directories better reflect their role as
integration examples rather than distributable packages.
Renames showcase/packages/ -> showcase/integrations/ and updates
the test docker-compose file reference accordingly.