Upgrade Blazor Server AdvancedSearch sample to .NET 8

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Summary

Upgrades AspNetCore/Blazor/AdvancedSearch.BlazorServer/EqDemo.BlazorServer.AdvancedSearch.csproj from .NET 6 to .NET 8 as part of the coordinated multi-session migration. Only this single project is touched; no other .csproj, root files, or sibling projects were modified.

.csproj changes

Item	Before	After
<TargetFramework>	net6.0	net8.0
Microsoft.EntityFrameworkCore.Sqlite	6.0.1	8.0.26
Microsoft.EntityFrameworkCore.SqlServer	6.0.1	8.0.26
Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore	6.0.1	8.0.26
Microsoft.Data.SqlClient	2.1.7	5.2.3
Microsoft.IdentityModel.JsonWebTokens	6.34.0	7.7.1
System.IdentityModel.Tokens.Jwt	6.34.0	7.7.1
System.Data.SqlClient	4.8.6	removed (replaced by Microsoft.Data.SqlClient / .NET 8 BCL)
System.Net.Http	4.3.4	removed (provided by .NET 8 BCL)
System.Text.RegularExpressions	4.3.1	removed (provided by .NET 8 BCL)
System.Drawing.Common	4.7.2	removed (provided by .NET 8 BCL)

System.Drawing.Common was on the removal list per the task spec; on .NET 8 the type ships in the runtime/shared framework so the explicit reference is no longer needed.

Code changes

None required. _Imports.razor references @using System.Net.Http, but the namespace is part of the BCL so removing the package reference does not affect the build. No other source files in AspNetCore/Blazor/AdvancedSearch.BlazorServer/ referenced any of the removed packages.

Build verification

Ran the following on the VM (using .NET SDK 8.0.420 installed via dotnet-install.sh):

dotnet restore AspNetCore/Blazor/AdvancedSearch.BlazorServer/EqDemo.BlazorServer.AdvancedSearch.csproj
dotnet build   AspNetCore/Blazor/AdvancedSearch.BlazorServer/EqDemo.BlazorServer.AdvancedSearch.csproj -c Release

Result:

Build succeeded.
    0 Warning(s)
    0 Error(s)

CI

CI status will be polled with git(action="pr_checks", wait_mode="all") after the PR is opened and reported in the final session message.

Review & Testing Checklist for Human

• Confirm dotnet build -c Release on EqDemo.BlazorServer.AdvancedSearch.csproj succeeds in your environment with the .NET 8 SDK.
• Smoke-test the Blazor Server app locally: run it, navigate to the Advanced Search page, build a query against the bundled NWind sample DB, and confirm results render and Excel/PDF export still work (the EasyData/Korzh packages are unchanged but their transitive dependencies pulled by EF Core 8 differ).
• Verify SQL Server connectivity still works if you use the SqlServer provider (Microsoft.Data.SqlClient bumped from 2.1.7 → 5.2.3 — connection strings using legacy encryption defaults may need Encrypt=False or a server cert update; see Microsoft.Data.SqlClient 4.0+ breaking changes).

Notes

• Scope strictly limited to the single .csproj listed above. No global.json, Directory.Build.props, .sln, or other projects were touched.
• Package versions chosen as the latest stable 8.0.x / 5.2.x / 7.x available on NuGet.org at the time of the upgrade.

Link to Devin session: https://app.devin.ai/sessions/f94354c6acc24c58906392b70ccdc031
Requested by: @tobydrinkall

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