[MohamedHasan3644]

Description

With global WebAssembly interactivity, navigating directly to /Error initially renders the Error page on the server. When WebAssembly activates, the client router replaces that content with NotFound because the Error component exists only in the server project and is not discoverable in the client assembly.

Global Auto interactivity is also affected when routing runs on WebAssembly.

Changes

• Generate the Error page in the client project for global WebAssembly and Autoconfigurations, alongside the router and layout.
• Pass the server's HTTP request identifier to Routes as a serializableparameter instead of requiring HttpContext in the client component.
• Cascade that identifier only during prerendering. The Error page retains its existing persistent Request ID state so the resolved identifier survives interactive activation.
• Avoid reusing the original HTTP request identifier when navigating to Error later through the interactive router.
• Preserve the existing Error page placement and HttpContext-based behavior for static rendering, Server-only interactivity, and per-page configurations.

This keeps the layout interactive rather than excluding the Error route from interactive rendering. No framework router changes are required.

Test coverage

Added BlazorWebTemplate_ErrorPageSurvivesInteractiveActivation with five cases:

• Global WebAssembly.
• Global WebAssembly with Activity.Current suppressed to exercise the HTTP TraceIdentifier fallback.
• Global WebAssembly with Individual authentication.
• Global Auto.
• Global Auto with Individual authentication.

Each case exercises both built and published generated applications and verifies:

• Error content and Request ID before activation.
• Error content and the same Request ID after activation.
• Working layout interactivity.
• Actual WebAssembly rendering on a subsequent Auto visit.
• Counter interaction and navigation back to Error without a stale HTTP
  Request ID.
• NotFound behavior and layout interactivity for a genuinely missing route.

Also added global WebAssembly and Auto configurations to the existing BlazorWebTemplate_Works smoke test.

Output

Before fix

63842-without-fix.mp4

After fix

63842-with-fix.mp4

Fixes #63842

[dotnet-policy-service]

Thanks for your PR, @MohamedHasan3644. Someone from the team will get assigned to your PR shortly and we'll get it reviewed.