convert-blazor-server-to-webapp

# Convert Blazor Server App to Blazor Web App This skill helps an agent convert a pre-.NET 8 Blazor Server app into a .NET 8+ Blazor Web App. The old hosting model uses `AddServerSideBlazor`/`MapBlazorHub` with a `_Host.cshtml` Razor Page as the entry point. The new Blazor Web App model uses `AddRazorComponents`/`MapRazorComponents` with an `App.razor` root component, enabling per-component render modes, enhanced navigation, streaming rendering, and other .NET 8+ features. The converted app uses `InteractiveServer` render mode to preserve existing interactive behavior. ## When to Use - Migrating a Blazor Server app from .NET 6 or .NET 7 to .NET 8+ - App currently uses `AddServerSideBlazor()` and `MapBlazorHub()` in `Program.cs` (or `Startup.cs`) - App uses `Pages/_Host.cshtml` (or `_Host.razor`) as the host page with Component Tag Helpers - Want to adopt new Blazor Web App features while keeping interactive server rendering ## When Not to Use - **The app already uses `AddRazorComponents` and `MapRazorComponents`.** It is already a Blazor Web App — no conversion is needed. Stop here and tell the user the app is already using the Blazor Web App model. - Blazor WebAssembly or hosted Blazor WebAssembly app — these have a different migration path - The app should stay on the legacy Blazor Server hosting model (just update TFM and packages) - The app targets .NET Framework — it must be migrated to .NET first ## Inputs | Input | Required | Description | |-------|----------|--...