docs(button): document IgbButton click handling syntax

[georgianastasov]

Closes #248

Documents the correct click-handling syntax for IgbButton.

For IgbButton, native click handlers should use the lowercase DOM-style attribute:

<IgbButton onclick="@(ResetFilters)">
    Clear filters
</IgbButton>

Instead of Blazor’s usual event directive:

<IgbButton @onclick="ResetFilters">
    Clear filters
</IgbButton>

In tested usage with IgniteUI.Blazor and Blazor WebAssembly on .NET 9, @onclick on IgbButton does not reliably fire.

The reason is specific to how the IgbButton Blazor wrapper handles unmatched attributes and forwards native DOM events to the underlying web component. The @onclick directive can be captured through the component parameter path and is not wired to the actual button click event.

Using onclick="@(Handler)" correctly wires the native click event for IgbButton.

[Copilot]

Pull request overview

Documents Blazor-specific click handling guidance for IgbButton, clarifying the lowercase DOM-style onclick syntax intended to address issue #248.

Changes:

• Adds a Blazor-only “Click Event Handling” section to the Button docs.
• Shows non-working @onclick syntax and recommended onclick="@(HandleClick)" usage.
• Adds a note scoping the behavior to IgbButton.

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