Add read-only banner for disconnected wallet state

[Chucks1093]

Summary
Add read-only banner for disconnected wallet state

Scope

• show clear read-only banner when wallet is disconnected\n- keep browse capabilities enabled\n- hide banner when wallet reconnects

Acceptance Criteria

• scoped change is implemented with no unrelated file churn
• docs/tests are updated where applicable
• contributor can validate the outcome locally

Contributor coordination: if you pick this up, reach out in Telegram for updates or clarification: https://t.me/accesslayerorg

[Peolite001]

@Peolite001 has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

I would love to work on this issue.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Peolite001 to this issue.

[drips-wave]

Congratulations, @Peolite001! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on April 29, 2026.

🧑‍💻 @Peolite001: 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 marked as completed by a Drips Wave moderator for @Peolite001 as part of the Stellar Wave Program's 4th Wave 🥳

Moderator's reason: [Auto-assessed] The contributor has implemented the requested read-only banner along with the necessary wallet state infrastructure (hook, context, and components) to support its functionality. The PR includes comprehensive unit tests for the new logic and directly fulfills the acceptance criteria without any maintainer objections.

😎 @Peolite001: You earned 100 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.

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

ℹ️ Note: This issue was marked complete via moderation. Points were issued even though the GitHub issue remains open.