feat(subscriptions): add native share sheet to SubscriptionCard and SubscriptionDetail

[fantababa]

Closes #74

feat(subscriptions): add native share sheet to SubscriptionCard and SubscriptionDetail

Add share functionality to subscription components using the native Share API from react-native.

• SubscriptionCard: adds a Share button on the left of the actions row that triggers the native share sheet with subscription name, price, billing cycle, and a deep link placeholder
• SubscriptionDetailScreen: adds a Share button in the header alongside the existing Edit button, using the same share payload
• Both implementations wrap Share.share() in try/catch and silently ignore Share.dismissedAction to handle cancellation gracefully
• No sensitive data (crypto keys, gas info, group membership) is included in the shared payload

---

Pull Request Checklist

Quality Gates (All must pass before merge)

• Lint: Code passes ESLint and Prettier checks
• Type Check: TypeScript compilation succeeds
• Tests: All tests pass
• Build: Project builds successfully
• Rust Format: Smart contract formatting is correct
• Rust Clippy: Smart contract linting passes
• Rust Tests: All smart contract tests pass
• Rust Build: Smart contracts compile successfully

Additional Requirements

• New code has appropriate TypeScript types
• No hardcoded secrets or credentials
• New features have corresponding tests
• Documentation updated if needed

Reviewers

• At least 1 approval required for merge
• All CI checks must be green

---

[drips-wave]

@fantababa Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

Learn more about application limits

[Smartdevs17]

merge conflicts

[Smartdevs17]

⚠️ Merge failed — check CI status.

🤖 Drips Wave Merge Agent