Feature request: Add dark variant support to Tabs component

[Pedrocanoas]

Description:

Currently, the Tabs component does not provide a built-in dark variant or an easy way to switch themes. This limits its usability in applications that support dark mode or require theme customization.

I would like to suggest adding support for a dark variant (or a more flexible theming mechanism) similar to other components.

Below are two examples for comparison:

1. Default Tabs component (PrimeVue, no customization)
2. Custom Tabs implementation with dark styling

Expected behavior:

• Ability to switch between light and dark variants (e.g., via a variant prop)
• Consistent styling API aligned with other components
• Ideally leveraging existing design tokens or CSS variables

Additional context:

Having native support for theming would reduce the need for custom overrides and improve consistency across applications using the component.