LayoutShell's <main> sets overflow:hidden + min-height:0; pages must
handle their own scroll. SwaggerPage's root div had no height constraint,
so the Swagger UI rendered below the viewport with no scrollbar.
Match the pattern used by AppsTab/DashboardTab/etc.: flex:1 + min-height:0
+ overflow-y:auto on the page root. Inline style since this is a leaf
page with no existing module.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>