mobile: add 'Report Bug' action to `SettingsScreen`

[ShantKhatri]

Summary

Add an in-app link button in apps/mobile/src/screens/SettingsScreen.tsx that opens mail composer or in-app web page for bug report.

Tasks

• add button with text 'Report an issue'.
• open mailto:support@devcard.dev?subject=Bug%20Report on press using Linking.openURL.
• add short description text about what to include in report.

Acceptance Criteria

• feature renders and action triggers, no app crash.
• adds clear contributor-friendly help path.

[Vishakhayadavv]

Hey! I'm a GSSoC contributor and I'd love to work on this issue. I've gone through the codebase and have a good idea of how to approach it. Could you please assign it to me?

[ShantKhatri]

Hey! I'm a GSSoC contributor and I'd love to work on this issue. I've gone through the codebase and have a good idea of how to approach it. Could you please assign it to me?

Warm Welcome. Assigning this to you.

[Vishakhayadavv]

Thank you for the warm welcome!
I’ll start working on the issue and keep you updated.