fix(shine-border): restore animation and update Tailwind config usage

[Nuu-maan]

Fixes #707

This PR addresses the missing shine-border animation by:

✅ Fixes

• Ensured @keyframes shine and --animate-shine are included in styles/globals.css
• Confirmed that globals.css is properly imported in app/layout.tsx
• Updated tailwind.config.mjs to include all relevant content paths so motion-safe:animate-shine is preserved
• Added optional disableMask prop to ShineBorder to make debugging easier (can be toggled to test if masking is hiding the shine)

📖 Docs Suggestion

The current docs for shine-border should include:

// tailwind.config.mjs
export default {
  theme: {
    extend: {
      animation: {
        shine: "shine var(--duration) infinite linear",
      },
      keyframes: {
        shine: {
          "0%": { backgroundPosition: "0% 0%" },
          "50%": { backgroundPosition: "100% 100%" },
          "100%": { backgroundPosition: "0% 0%" },
        },
      },
    },
  },
}

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