Add matured lock withdrawal flow

[El-swaggerito]

Description

Difficulty: Expert

Type: Feature

Summary

Add a flow for withdrawing a matured vault lock.

Current Behaviour

Users need a clear withdrawal path when locks mature.

Expected Behaviour

The app should guide users through eligibility, confirmation, loading, success, and failure states.

Suggested Implementation

Create a withdrawal flow that can later connect to SDK vault methods.

Files or Areas Likely Affected

app/
src/features/vault/
src/components/

Acceptance Criteria

• Matured withdrawal flow is added.
• Eligibility is displayed.
• Confirmation step is included.
• Loading and failure states are handled.
• SDK assumptions are documented.

Additional Notes

Do not imply real withdrawal is live until integrated.

[Killerjunior]

I’ve reviewed the issue details and documentation, and I understand the problem statement and expected outcome. Please assign this task to me — I’m ready to start working on it.

[Adeolu01]

Hi! This looks like a great fit for my experience. I'm a full-stack blockchain developer, and I'd love to implement this withdrawal flow with a smooth UX and a structure that's ready for SDK integration later.

[grantfox-oss]

🦊 GrantFox — @Adeolu01 has been assigned to this issue as part of the Official Campaign | FWC26 campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #264)
2. Your PR will be reviewed by the Axionvera maintainers

Good luck! Track your progress on GrantFox.

[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign | FWC26 campaign!

@Adeolu01's PR #289 was approved and merged by @El-swaggerito.

🏆 @Adeolu01: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (134 total points). Track your full progress on GrantFox.

👏 Great work, @Adeolu01! Keep contributing to Axionvera.