feat: android scan credential QR code

[Bushstar]

• Resolves: Android: add ability to scan credential from QR code #1034

[Copilot]

Pull Request Overview

This PR adds QR code scanning functionality for credential DIDs on Android by implementing a reusable QR scanner utility and integrating it into both the authentication and credential management workflows.

• Consolidates QR scanning logic into a shared utility function
• Enhances DID extraction to support multiple URL protocols (mdip:, https:, http:) and query parameter patterns
• Adds QR scan button to the credential input field in HeldTab

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
apps/android/src/utils/utils.ts	Adds BarcodeScanner import, enhances extractDid function with expanded protocol support, and implements scanQrCode utility function
apps/android/src/components/HeldTab.tsx	Integrates QR scanning functionality with camera icon button in credential input field
apps/android/src/components/AuthTab.tsx	Refactors to use shared scanQrCode utility, removing duplicated scanning logic

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