[10.0] Update the Blazor movie dB tutorial

[guardrex]

Fixes #36343

Tom, Wade ... Just need one review to get this in. We're not going to wait for @danroth27 to look on this one. The tutorial requires this update to be viable for .NET 10 adopters. @danroth27 will possibly give me feedback later.

Sample updates have already been made. The 10.0 sample is alive and well at ...

https://github.com/dotnet/blazor-samples/tree/main/10.0/BlazorWebAppMovies

@danroth27 ... I guess you know that Javier fought with Copilot quite a bit before apparently giving up ...

• [Blazor] CRUD scaffolder improvements Scaffolding#3177
• [Blazor] Fix CRUD scaffolder compilation errors and middleware placement Scaffolding#3178

The upshot for us here is that I'm having the dev manually place the changes for the Not Found feature after scaffolding. We're also on the RC package for code gen ...

<PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="10.0.0-rc.1.25458.5" />

... and the scaffolder is setting up this foul property initializer in the Create component that we don't want ...

[SupplyParameterFromForm]
private Movie Movie { get; set; } = new();

I prefer not to get into the weeds with the change and reason for it in an introductory tutorial ... well ... unless you tell me that you want me to. 👂 If you see this before the PR merges and you want it fleshed out to do the prop init on component init, I'll do it on here. Otherwise, I'll version new guidance on a patch PR.

I've left myself inline tracking notes to react to the scaffolder updates as soon as they become available.

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Internal previews

📄 File	🔗 Preview link
aspnetcore/blazor/project-structure.md	aspnetcore/blazor/project-structure
aspnetcore/blazor/tutorials/movie-database-app/part-1.md	aspnetcore/blazor/tutorials/movie-database-app/part-1
aspnetcore/blazor/tutorials/movie-database-app/part-3.md	aspnetcore/blazor/tutorials/movie-database-app/part-3
aspnetcore/blazor/tutorials/movie-database-app/part-4.md	aspnetcore/blazor/tutorials/movie-database-app/part-4

[Copilot]

Pull Request Overview

This PR updates the Blazor movie database tutorial for .NET 10, implementing the new Not Found feature that uses NavigationManager.NotFound() instead of navigating to a non-existent endpoint. The changes use moniker ranges to differentiate between .NET 10 and earlier versions (8.0-9.0), acknowledging that the scaffolder doesn't yet support this feature and requires manual implementation.

Key changes:

• Adds .NET 10-specific code examples and instructions for implementing the NavigationManager.NotFound() method
• Uses moniker ranges (>= aspnetcore-10.0 and < aspnetcore-10.0) to version content appropriately
• Includes tracking comments for future scaffolder updates

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
part-4.md	Adds .NET 10 moniker-versioned section showing the UpdateMovie method with NavigationManager.NotFound() for concurrency exception handling
part-3.md	Adds .NET 10 instructions for manually implementing NotFound() in Details, Delete, and Edit components with diff examples
part-1.md	Adds missing ReconnectModal component entries to the layout components list
project-structure.md	Fixes typo changing .css to .js for ReconnectModal.razor.js file reference

[wadepickett]

Looks good. I'm not seeing any issues. Approved.