Add option to set icon for Collapse field title

[savosik]

It would be useful to have the ability to add an icon before the title text in Collapse fields. This would enhance the visual hierarchy and provide better context for collapsed sections.

Proposed functionality:

• Add a new method icon() to the Collapse class
• Allow passing an icon name or HTML string
• Render the icon before the title text

Example usage:

Collapse::make('Information', [ ] )
    ->icon('heroicons.information-circle')

[gacal]

i think This feature is also required for the block component.