Harden wallet connection and payment-state transitions across the app

[grantfox-oss]

Reduce user-facing failure states in wallet and payment flows by validating state transitions, network mismatch handling, and transaction confirmation messaging.

• Affected files: app/frontend/src/app/pay/page.tsx, app/frontend/src/components/SigningSummary.tsx, app/frontend/src/components/NetworkBadge.tsx, app/frontend/src/components/QRPreview.tsx, app/frontend/src/components/Header.tsx, app/frontend/src/lib/api.ts, app/frontend/src/app/dashboard/page.tsx, app/frontend/src/app/settings/page.tsx, app/frontend/src/hooks/analyticsApi.ts
• Acceptance criteria:
  • Wallet and payment pages handle disconnected, unsupported, or wrong-network states without broken UI states.
  • Transaction summary and confirmation steps clearly reflect final status and recovery actions.
  • Client-side wallet logic is validated against a representative matrix of failure scenarios.

[IamOluwatoyin]

interested in contributing to this issue. I will ensure the implementation is clean, tested and follows project convention

[felladaniel36-hash]

I'd like to claim this issue. I have reviewed the details and can begin working on a fix right away. Please assign it to me if it's still available. Thanks!

[grantfox-oss]

🦊 GrantFox — @IamOluwatoyin has been assigned to this issue as part of the Third Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #533)
2. Your PR will be reviewed by the BlockDash-Studios maintainers

Good luck! Track your progress on GrantFox.

[grantfox-oss]

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

@IamOluwatoyin's PR #553 was approved and merged by @MaryammAli.

🏆 @IamOluwatoyin: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (659 total points). Track your full progress on GrantFox.

👏 Great work, @IamOluwatoyin! Keep contributing to BlockDash-Studios.