Add circular variant to progress component

[jdc1898]

Summary

Adds a circular variant to the progress component using the existing variants pattern (matching checkbox, radio, and select).

• Restructures progress.blade.php into progress/index.blade.php + progress/variants/default.blade.php (100% rename, zero changes to existing code)
• Adds progress/variants/circular.blade.php — SVG-based circular progress indicator
• Supports all existing color variants, five size presets (xs, sm, base, lg, xl), and an optional label overlay

Usage

{{-- Boolean shorthand --}}
<flux:progress value="75" circular />

{{-- Variant prop --}}
<flux:progress value="75" variant="circular" />

{{-- With color and size --}}
<flux:progress value="60" max="100" circular color="green" size="lg" />

{{-- With percentage label --}}
<flux:progress value="42" circular label />

{{-- With custom label slot --}}
<flux:progress value="3" max="5" circular label>
    3/5
</flux:progress>

Files

File	Description
progress/index.blade.php	Delegates to variant (same pattern as checkbox/radio/select)
progress/variants/default.blade.php	Existing linear progress, moved with zero changes
progress/variants/circular.blade.php	New circular SVG variant

[ganyicz]

Hi @jdc1898

Thanks for contributing. We're going to hold off on this for now. This is a good addition however requires more considerations around design, implementation and APIs. That said, we're open to adding this in the future.

Discussion: #2457