Fix dead receipt proof and share actions

[Quanwritescodes]

Summary

This PR fixes two dead actions in the transaction receipt flow:

• The proof-of-payout link now opens the payout URL through the native Linking API and shows a visible alert when the URL is unsupported or cannot be opened.
• The share button now calls the native React Native share sheet instead of only opening a read-only modal preview.

What changed

• Wired the proof-of-payout link to Linking.openURL with URL validation.
• Added a failure path that surfaces an Alert.alert instead of failing silently.
• Replaced the misleading modal-only share flow with a real Share.share invocation that includes a plain-text receipt summary.
• Added focused screen tests covering successful share behavior and proof-of-payout open/failure paths.

Notes

• This is intentionally scoped to the two receipt actions requested by SR-180 and SR-181.
• No broad test suite was run as part of this surgical fix.

Checklist

• Fix dead proof-of-payout action
• Fix dead share receipt action
• Add targeted screen tests
• Keep PR scope limited to the receipt issue"

closes #1323
closes #1324

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