Implement mobile transaction receipt screen

[El-swaggerito]

Description

Difficulty: Expert

Type: Feature

Summary

Implement a transaction receipt screen for payment outcomes.

Current Behaviour

Users may not have a consistent receipt view for successful, pending, failed, rejected, or unknown transactions.

Expected Behaviour

The mobile app should show a typed receipt screen with transaction status, amount, recipient, asset, timestamp, and explorer link where available.

Suggested Implementation

Create receipt types, UI screen, navigation integration, fixtures, tests, and docs.

Files or Areas Likely Affected

• src/transactions/
• src/screens/
• src/components/
• src/navigation/
• tests/
• docs/

Acceptance Criteria

• Transaction receipt screen is implemented.
• Success, pending, failed, rejected, and unknown states are represented.
• Receipt shows key transaction information.
• Explorer link is supported where available.
• Tests cover major receipt states.
• Docs explain receipt limitations.

Additional Notes

This improves payment UX.