feat: add share button for comparison results

[NRR385]

Summary

• Add a share button to comparison results
• Use the Web Share API when available with clipboard fallback
• Preserve comparison URL parameters, including selected languages
• Add English and Arabic share labels and feedback

Testing

• pnpm run test — 131/131 tests passed
• npx tsc --noEmit — passed
• pnpm run validate-locales — passed
• pnpm run lint — passed
• Manually tested native sharing and shared URL reload
• Manually verified English and Arabic UI

Closes #191

[vercel]

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[github-actions]

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[vercel]

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Project	Deployment	Actions	Updated
dev-impact	Ready	Preview	Oct 3, 2026 8:59pm UTC

[O2sa]

🎊 Welcome, @NRR385! Your first contribution has been merged! 🚀

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