[Adedayo0101]

Summary

• Introduces a reusable, accessible confirmation dialog for destructive and high-impact actions.
• Requires typed confirmation for irreversible financial and high-impact governance or administrative actions.
• Migrates affected frontend workflows to use the shared dialog, with cancellation, focus management, loading states, and error handling.
• Adds tests for confirmation behavior and migrated workflows.

Closes #868

Testing

• Focused Jest tests passed (3 suites, 17 tests).
• Frontend TypeScript check passed.
• git diff --check passed.
• Focused ESLint passed for the shared dialog and its tests.
• Full changed-file ESLint: existing issues remain on unchanged lines in affected files.

Checklist

• Tests cover the change.
• Backend test-data factory requirements are not applicable; no loan, applicant, or milestone fixture tests were added.
• No secrets or unintended client-side environment variables were introduced.
• Documentation changes are not applicable; no documentation or configuration changes were included.