Feature: Add CssPath parameter to RadzenTheme

[franklupo]

Is your feature request related to a problem? Please describe.

When using <RadzenTheme> with custom themes in Razor Class Library (RCL) scenarios, there's no way to specify where the CSS files are located. The component hardcodes the CSS path to /css/ for non-embedded themes, causing 404 errors when CSS files are served from a different location (e.g., _content/MyPackage/css/).

Describe the solution you'd like

Add a CssPath parameter to the RadzenTheme component to allow specifying a custom CSS directory for custom themes:

<RadzenTheme Theme="mytheme" 
             Wcag="true" 
             CssPath="_content/MyPackage/css" />

This would allow RCL authors to bundle custom theme CSS files in their package and specify where they're located.

[Parameter] public string? CssPath { get; set; }

private string Path => Embedded 
    ? "_content/Radzen.Blazor/css" 
    : (!string.IsNullOrEmpty(CssPath) ? CssPath : "css");

Best regards

[akorchev]

Hi @franklupo,

We would gladly accept a pull request with the suggested implementation!