feat(sessions): add detail page, Notification component, and session API improvements

- add SessionDetailPage with breadcrumbs, DescriptionList, status badge, masked token
- add Notification component (info/success/error/warning/note variants) for contextual messages
- use Notification for 404 errors on session and environment detail pages
- add GET /sessions/:id endpoint; sanitize token (head…tail) and strip cookies/localStorage
- change DELETE /sessions/:id to return 204 No Content so client redirect works correctly
- add onRowClick prop to Table for clickable rows; stop propagation on actions column
- update status badges: open=success (green), closed=error (red) on both list and detail

client/src/ui/index.ts

@@ -33,5 +33,8 @@ export type { ContextMenuProps, ContextMenuItem } from './ContextMenu/ContextMen
 export { DescriptionList } from './DescriptionList/DescriptionList';
 export type { DescriptionListProps, DescriptionListItem } from './DescriptionList/DescriptionList';
 
+export { Notification } from './Notification/Notification';
+export type { NotificationProps, NotificationVariant } from './Notification/Notification';
+
 export { Table } from './Table/Table';
 export type { TableProps, TableColumn } from './Table/Table';