fix(remix): data table review follow-ups

[leoafarias]

Follow-up to #109.

Fixes

• Preserve StyleProvider-inherited DataTable stylers during per-row widget-state resolution.
• Clear the row-index hover state when row content changes so unmounted regions cannot leak hover styling.
• Keep the pagination footer outside the horizontal table scroller, following Flutter's PaginatedDataTable sibling-footer precedent.
• Assert that a paginated rows list contains no more than the visible page size.
• Document that raw lastBodyRow specs replace rather than merge with bodyRow.
• Restore alphabetical ordering for the Remix README component list.

Intentionally out of scope

• Existing footer-row overflow at extremely narrow viewports, where the Spacer collapses first.
• The empty surface remains inside the horizontally scrolling table content next to the header, per its documented contract.