New dynamic route /cases/[caseNumber] wired to the FastAPI details
endpoint, using Next 16's async params pattern with React's use()
hook. TanStack Query handles 5s refetchInterval so the page
self-updates during long-running processing without manual polling.
New components: CaseHeader (breadcrumb + meta), WorkflowTimeline
(5-phase RTL pipeline view), DocumentsPanel (categorized list).
Tabs split overview/documents/actions.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
