Add an aria-live region for CSV batch execution progress

[Austinaminu2]

Description

During the CSV batch-create flow in `app/app/create/batch/page.tsx`, sequential stream creation and per-row execution errors update visually with no live-region announcement, so screen-reader/keyboard-only users get no feedback while the multi-step execute flow runs.

Location

`app/app/create/batch/page.tsx`

Task

Add an `aria-live="polite"` region that announces progress updates (e.g. "Creating stream 3 of 10", "Row 5 failed: insufficient balance") as the batch executes.

Good for contributors because

Well-scoped accessibility addition with a clear, testable outcome (screen reader announces progress).

[Adjutant500]

@Adjutant500 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi Maintainer please I will like to work on this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Adjutant500 to this issue.

[Joel234-png]

@Joel234-png has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hey maintainer, I'd like to show you what am capable of doing. Kindly assign this to me.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Joel234-png to this issue.

[drips-wave]

Congratulations, @Joel234-png! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

🧑‍💻 @Joel234-png: 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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