Upgrade to dotnet 9 and apply new features from dotnet 9 and Blazor

[kirkone]

Upgrade the project to target .NET 9. As part of the upgrade, review and incorporate new features, improvements, and best practices introduced in .NET 9 and the latest Blazor releases.

Tasks:

• Update all project files and dependencies to use .NET 9.
• Review .NET 9 release notes for new features, performance improvements, and breaking changes.
• Refactor code to adopt new APIs, patterns, or features where beneficial.
• Update Blazor components to use the latest Blazor features and patterns in .NET 9.
• Test the application thoroughly to ensure compatibility and stability after the upgrade.

References:

• .NET 9 official release notes and migration guides
• Blazor documentation for .NET 9

Please ensure that all new language features, performance optimizations, and recommended changes are considered and, where they add value, are integrated into the codebase.