feat: add Astro, Svelte, and Nuxt.js wrapper components

[Muneerali199]

Addressed Issues:

Fixes #46, #47, #48

Screenshots/Recordings:

N/A (library code only)

Additional Notes:

This PR adds native framework wrappers for three popular frameworks:

Added files:

1. src/social-share-button-astro.astro - Astro component with client-side hydration
2. src/social-share-button-svelte.svelte - Svelte/SvelteKit component
3. src/social-share-button-nuxt.vue - Nuxt.js/Vue 3 component

Key features:

• All wrappers include SSR guards (typeof window !== 'undefined')
• Follow the same pattern as the existing React wrapper
• Support all SocialShareButton options as props
• Proper cleanup on component destruction

Usage Examples:

Astro:

---
import SocialShareButton from './components/SocialShareButton.astro';
---
<SocialShareButton url="https://example.com" client:load />

Svelte:

<script>
  import SocialShareButton from './SocialShareButton.svelte';
</script>
<SocialShareButton url="https://example.com" />

Nuxt/Vue:

<template>
  <SocialShareButton url="https://example.com" />
</template>
<script setup>
import SocialShareButton from './SocialShareButton.vue';
</script>

Checklist

• My code follows the project's code style and conventions
• I have made corresponding changes to the documentation
• My changes generate no new warnings or errors
• I have joined the Discord server and I will share a link to this PR with the project maintainers there
• I have read the Contributing Guidelines

AI Usage Disclosure

• This PR contains AI-generated code. I have read the AI Usage Policy and this PR complies with this policy.

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📥 Commits

Reviewing files that changed from the base of the PR and between 9e7e113 and 5a94f3b.

📒 Files selected for processing (3)

• src/social-share-button-astro.astro
• src/social-share-button-nuxt.vue
• src/social-share-button-svelte.svelte

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