enhance Pagination with first/last controls and result summary

[mysterio123865]

The summary:

• Updates automatically as the page changes.
• Correctly handles the first and last pages.
• Calculates the displayed item range from the current page.
• Is announced through an ARIA live region so screen reader users receive updates whenever pagination changes.

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🔹 Preserved Existing Behavior

The enhancement remains fully backward compatible.

• Existing usages continue to work without modification.
• The component still renders nothing when pageCount <= 1.
• New functionality is enabled only when the additional props are supplied.

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Documentation

Updated docs/components.md to document:

• showFirstLast
• totalItems
• pageSize

including their behavior and intended usage.

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Testing

Expanded the component test suite to validate the new functionality, including:

• First button navigation.
• Last button navigation.
• Disabled states.
• Result summary rendering.
• Live-region updates.
• Existing pagination behavior remains unchanged.

Verification

• ✅ 34 tests passing
• ✅ 100% coverage for Pagination.tsx
• ✅ Build succeeds
• ✅ Lint passes for all modified files (repository-wide lint issues are pre-existing and unrelated to this change)

Notes

The changes are currently uncommitted and ready for review.

Tracking: Closes #299

[mikewheeleer]

clean work @mysterio123865 — does exactly what #299 asked. merging 🎉