fix(a11y): add aria-label to icon-only buttons in EnvManager

[RavindiFernando]

Summary

• Added aria-label to the Plus (Add Variable) icon button in the Env Manager header, replacing title which is only surfaced as a visual tooltip
• Added aria-label={Remove variable ${idx + 1}} to each row's Trash icon button so screen readers can distinguish between them
• Updated tests/env-manager.test.tsx to forward aria-label through the Button mock and replaced getByTitle queries with getByRole("button", { name: ... }) to align with the new attribute

Type of change

• Bug fix
• New feature
• Refactor
• Documentation
• Test or CI improvement
• Starter template change

Related issue

Closes #283

Validation

• npm run lint
• npm test
• npm run build

List any additional manual verification you performed:

• N/A

Screenshots or recordings

N/A. No visual change; accessibility attribute only.

Checklist

• I kept this PR focused on one primary change
• I updated documentation if behavior changed
• I did not commit secrets, local logs, or scratch files
• I am requesting review on the correct scope

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📥 Commits

Reviewing files that changed from the base of the PR and between 3fb728f and 335a956.

📒 Files selected for processing (2)

• modules/playground/components/env-manager.tsx
• tests/env-manager.test.tsx

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