Upgrade TailBlazor.List to .NET 9 with interactive auto support

[TaylorWatson]

Summary

• retarget the component library to net9.0, enable nullable/implicit usings, and update the package metadata and dependencies
• ensure the list template supports Blazor's interactive auto render mode and safely handles empty item collections
• refresh the documentation and imports to highlight the new .NET 9 support

Testing

• not run (dotnet CLI is unavailable in the execution environment)

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https://chatgpt.com/codex/tasks/task_e_68e704dd3670833295d6e601c6296719

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Remove unconditional RenderModeInteractiveAuto attribute

Applying @attribute [RenderModeInteractiveAuto] in the component library forces every consuming app to configure Blazor’s interactive auto render mode. Existing Blazor Server/WebAssembly apps that simply reference this component but have not registered interactive auto services will now throw InvalidOperationException at runtime because the render mode is unsupported. The list component previously worked in any app; after this change it crashes unless the host uses SSR with interactive auto. Consider leaving render mode decisions to the host or making this opt‑in so the package remains compatible with non‑SSR projects.

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