Add toast notifications and global loading states

[ogazboiz]

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Description

User actions need feedback. There are no toast notifications or global loading indicators. This is important for async blockchain operations where users need to know something is happening.

What Needs to Happen

• Install and wire react-hot-toast (or similar) in the root layout
• Success toasts: stream created, withdrawal confirmed, top-up sent, stream cancelled, stream paused/resumed
• Error toasts: wallet rejected, network error, insufficient balance, invalid address
• Loading spinners on all async data fetches (skeleton placeholders for stream lists)
• Buttons disabled with spinner while transaction is pending

Files

• frontend/src/app/layout.tsx

Acceptance Criteria

• Every user action shows success or error toast
• Skeleton loaders shown during data fetches
• Buttons non-interactive while tx is pending

[Samuel1505]

@Samuel1505 has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

please assign me this

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Samuel1505 to this issue.

[drips-wave]

Congratulations, @Samuel1505! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on April 29, 2026.

🧑‍💻 @Samuel1505: 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 🌊

[drips-wave]

This issue has been completed by @Samuel1505 as part of the Stellar Wave Program's 4th Wave 🥳

😎 @Samuel1505: You earned 200 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here. You can also Leave a review to share your experience working on this issue.

🧑‍💻 Repo maintainers: How'd the contributor do? Leave a review to share your experience working with them.