feat: a11y Keyboard Navigation for Modals

[Salmatcre8]

Closes #525

Description

This PR implements robust keyboard accessibility for modals by introducing a global useFocusTrap hook, ensuring users who navigate with keyboards cannot accidentally tab outside the modal context.

Changes Included

• New useFocusTrap Hook: Intercepts Tab and Shift+Tab keystrokes to cycle focus purely between the first and last interactive elements within a modal container.
• Auto-Focus & Restore: Automatically focuses the first interactive element when a modal opens, and importantly, restores focus to the original triggering element (e.g., the button that opened it) when the modal closes.
• Escape Key Integration: Added native support for closing the modal via the Escape key directly within the focus trap hook, removing the need for duplicate logic across different components.
• Aria Roles: Added role="dialog" and aria-modal="true" to ConfirmDialog and TransactionConfirmModal for improved screen-reader announcement.

(Note: TransactionDetailModal.tsx was excluded as it did not exist in the codebase).

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