Add bounded backpressure to websocket outbound queue

[RUKAYAT-CODER]

Background

Outbound messages queue without bound while disconnected. Add a bounded queue with a documented overflow policy.

Files to modify (2-3)

src/lib/websocketManager.ts
src/lib/realtime/connectionSupervisor.ts

Acceptance Criteria

Implemented across the listed files

Unit/integration tests added or updated and passing

No regression; follows project coding standards

[MerlinTheWhiz]

@MerlinTheWhiz has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi there, let me handle this. I can implement this nicely.
Please assign.

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

[drips-wave]

Congratulations, @MerlinTheWhiz! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

🧑‍💻 @MerlinTheWhiz: 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.

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