feat(navigation): add optimistic updates

[MrOmale]

closes #723

Description

Closes #

Type of Change

• Bug fix (non-breaking change that resolves an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Refactor (no functional change, internal code improvement)
• Documentation update

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Pre-flight Checklist

All items must be checked before requesting review.

• npm run lint passes with no errors
• npm test passes with no failures
• npm run build completes successfully

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Testing & Coverage

• Module test coverage for impacted files meets or exceeds the 95% minimum threshold
  (run npm test -- --coverage and check the per-file table)
• If this PR adds or modifies UI components, accessibility tests were written using
  the shared utilities in src/test-utils/a11y.tsx

What was tested?

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Accessibility & Security Notes

Accessibility

Security

[drips-wave]

@MrOmale Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

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