Problem: Page components were not rendering content because @rendermode was only
on App.razor and Routes.razor, not on individual @page components.
Solution: Add @rendermode InteractiveWebAssembly to all admin page components
to ensure they render interactively in WebAssembly context.
Result: All admin pages now render their content correctly.
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>