feat: add is-flat-flash style

Author: ArgoZhang

src/BootstrapBlazor/Components/Light/Light.razor.cs

@@ -16,6 +16,7 @@ public partial class Light
     protected string? ClassString => CssBuilder.Default("light")
         .AddClass("is-flat", IsFlat)
         .AddClass("flash", IsFlash && !IsFlat)
+        .AddClass("is-flat-flash", IsFlash && IsFlat)
         .AddClass($"light-{Color.ToDescriptionString()}", Color != Color.None)
         .AddClassFromAttributes(AdditionalAttributes)
         .Build();

src/BootstrapBlazor/Components/Light/Light.razor.scss

@@ -76,6 +76,9 @@
             height: 100%;
             border-radius: 50%;
             border: 1px solid var(--bb-light-bg);
+        }
+
+        &.is-flat-flash:after {
             animation: light-flat 1.2s infinite ease-in-out;
         }
     }
@@ -196,7 +199,7 @@
 @include animation(light-danger, #e17777, #892726);
 @include animation(light-success, #5cb85c, #116811);
 @include animation(light-info, #5bc0de, #1d7792);
-@include animation(light-light-warning, #ffc107, #cc9f18);
+@include animation(light-warning, #ffc107, #cc9f18);
 @include animation(light-primary, #007bff, #0f5fb5);
 @include animation(light-secondary, #6c757d, #4b5054);
 @include animation(light-dark, #6061e2, #3232a0);