Card: Add a border design token

[BenJackGill]

Describe the bug

The Card element has a card.border.radius design token.

But it impossible to set card.border design token preset.

This is very strange since the home page shows the Aura theme Cards that have a flat border. In reality, those Card elements have a shadow and no border is able to be set.

To make something that looks like the homepage we need to do something like this, which is only partially possible without the card.border design token:

import { definePreset } from '@primeuix/themes';
import Aura from '@primeuix/themes/aura';

export const preset = definePreset(Aura, {
  components: {
    card: {
      root: {
        border: 'border-surface border', // This does not work because there is no `border` token
        shadow: 'none', // This works, it removes the shadow
      },
    },
  },
});

This is very strange since the home page shows the Aura theme cards that have a flat border. In reality, those Card elements have a shadow and no border is able to be set.

Pull Request Link

No response

Reason for not contributing a PR

• Lack of time
• Unsure how to implement the fix/feature
• Difficulty understanding the codebase
• Other

Other Reason

No response

Reproducer

N/A

Environment

primevue 4.3.1

Vue version

3.5.13

PrimeVue version

4.3.1

Node version

No response

Browser(s)

No response

Steps to reproduce the behavior

N/A

Expected behavior

N/A