Implement proper asset balance display with trustlines

[therealjhay]

Description: The wallet page shows hardcoded USDC and XLM balances. A real implementation should fetch balances from the Stellar Horizon API and display all assets the account holds (including non-standard assets via trustlines).

Requirements:

• Replace the mock refreshBalances with actual Horizon API calls
• Fetch /accounts/{address} from Horizon and parse the balances array
• Display all assets: native (XLM), issued assets (USDC, etc.)
• Show the asset issuer for non-native assets
• Show a loading state while fetching, an error state on failure, and an empty state for new accounts

Suggested execution steps:

1. In lib/store/walletStore.ts, update refreshBalances to call Horizon
2. Use the HORIZON_URL from constants.ts
3. Parse the response into the AssetBalance[] type
4. Update the wallet page to render dynamic balances instead of hardcoded ones
5. Add trustline support: show which assets the account has trustlines for
6. Handle the "account not found" Horizon response (account not funded yet)

Example commit message:

feat(stellar): replace mock wallet balances with real Horizon API data

Updated refreshBalances to fetch from Stellar Horizon /accounts/{address}
endpoint. Displays all held assets (XLM, USDC, custom) with issuer info.
Handles loading, error, and unfunded account states. Removes hardcoded
balance mock data from the wallet page.

[Bug-Hunter-X]

@Bug-Hunter-X has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi! I'd love to work on this. I've gone through the description and I already know exactly what needs to be done. I'll deliver a clean, well-tested PR that meets every acceptance criterion. And also almost the deadline of this wave, can I work on the issue ser?

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Bug-Hunter-X to this issue.

[devOgazi]

@devOgazi has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Please assign me I can work on this

ℹ️ Repo Maintainers: To accept this application, review their application or assign @devOgazi to this issue.

[mordabdul1]

@mordabdul1 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello, I’ve gone through the requirements and I’m confident I can implement a proper solution that matches the acceptance criteria. Kindly assign this issue to me.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @mordabdul1 to this issue.

[Shecodes174]

@Shecodes174 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi Maintainer I have read the description and I can resolve this issue please kindly assign to me.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Shecodes174 to this issue.

[adetomiwa21]

@adetomiwa21 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Kindly assign me this issue , thank you

ℹ️ Repo Maintainers: To accept this application, review their application or assign @adetomiwa21 to this issue.

[drips-wave]

Congratulations, @adetomiwa21! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

🧑‍💻 @adetomiwa21: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊