Package update

[Brano5]

This pull request updates the Tailwind CSS setup in the Blazor presentation controls and sandbox app, and bumps the version of the Inxton.Operon package. The main change is a simplification and standardization of the Tailwind CSS import and layering approach, removing custom theme and base CSS definitions from the sandbox app and aligning both CSS files to use a consistent structure.

Tailwind CSS configuration updates:

• Both AXSharp.Presentation.Blazor.Controls/wwwroot/css/tailwind.css and IxBlazor.App/wwwroot/css/tailwind.css now use @layer theme, base, components, utilities; and import only tailwindcss/theme.css and tailwindcss/utilities.css with explicit layering, removing direct imports of the main Tailwind file and custom CSS.
• The sandbox app's tailwind.css had all custom theme variables, base styles, and dark mode overrides removed, streamlining the file to match the controls' CSS and rely more on Tailwind's built-in theming.

Dependency update:

• Updated the Inxton.Operon NuGet package version from 0.3.0-alpha.102 to 0.3.0-alpha.104 in Directory.Packages.props.