[ghabriel25]

Summary

The Callout component (and its heading sub-component) were the only places still using the older class:icon attribute for icon class targeting.

Everywhere else in Flux, icon-related attributes follow the icon:* convention (icon:variant, icon:trailing, etc.), and class targeting generally uses the *:class form (input:class, etc.).

This PR brings the Callout components in line with the rest of the library.

Changes

• Added support for icon:class on both flux:callout and flux:callout.heading
• Kept class:icon working for backwards compatibility (marked as @deprecated in a comment)
• No breaking changes

Usage

{{-- Preferred (new) --}}
<flux:callout icon="information-circle" icon:class="text-blue-500" />

{{-- Still works (deprecated) --}}
<flux:callout icon="information-circle" class:icon="text-blue-500" />

Same applies to <flux:callout.heading>.

Motivation

Having two different attribute names for the same purpose (class:icon vs icon:class) is confusing for users and inconsistent with the rest of the component library. Standardizing on icon:class makes the API more predictable while preserving existing code.