core: implement transaction history with Stellar Expert links

[EmeditWeb]

Problem

Users have no way to see their on-chain transaction
history in the web app.

What To Build

Build /history page with:

1. Transaction timeline (most recent first)
2. Filter controls (by type, date range, status)
3. CSV export
4. Expandable transaction details
5. Pending transactions section

Files To Touch

• src/pages/History.tsx (new)
• src/services/history.service.ts (new)
• src/router/index.tsx

Acceptance Criteria

• All transaction types shown
• Stellar Expert links correct
• Filter and date range work
• CSV export works
• npm run build passes

Mandatory Checks Before PR

• npm run build passes
• No any types
• PR references this issue

[Godfrey-Delight]

I'd like to work on this. I'll build a transaction history view that fetches the user's on-chain transactions via the Stellar SDK and displays them in a paginated list. PR within 48 hours.

[grantfox-oss]

🦊 GrantFox — @Godfrey-Delight has been assigned to this issue as part of the Official Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #26)
2. Your PR will be reviewed by the StepFi-app 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 campaign!

@Godfrey-Delight's PR #36 was approved and merged by @EmeditWeb.

🏆 @Godfrey-Delight: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (83 total points). Track your full progress on GrantFox.

👏 Great work, @Godfrey-Delight! Keep contributing to StepFi-app.