Add accessible announcements for wallet and escrow updates

[Luchistack]

#close #1125

Summary

• Added robust screen-reader announcement helpers and a dedicated live-region announcer component (ScreenReaderAnnouncer) to notify assistive-tech users of critical wallet connection states and escrow transaction updates.
• Implemented polite and assertive live-region mechanisms to ensure screen readers announce state transitions without stealing keyboard focus.

Approach & Scope

• Repository Scope: Talenttrust/Talenttrust-Frontend only.
• State Changes: Meaningful states (pending, success, failure, and retry actions) are announced explicitly once.
• Boundaries: Maintained explicit separation of wallet, network, and authorization boundaries without exposing sensitive transaction values or private keys.

Edge Cases Covered & Tested

• Rapid state changes: Verified live regions handle fast-paced status shifts correctly.
• Same state repeated: Handled sequential identical announcements gracefully.
• Screen reader navigation: Confirmed proper use of aria-live="polite" for general updates and aria-live="assertive" for critical failures/errors.
• Component unmount: Clean listener disposal and state reset upon unmounting.

Test Evidence & Verification

• Added dedicated unit and accessibility tests in src/__tests__/accessibility/announcements.test.tsx.
• Ran local quality gates (npm test, npm run lint, and npm run build) with zero errors or regressions.

#closes

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