feat: add configurable rows-per-page selector

[anxkhn]

Description:
This PR enhances the table pagination experience by allowing users to choose how many rows to display per page, instead of the previous fixed 10 rows. While the default remains 10 rows for consistency, users can now select 20, 50, 100, or “All” to view more results at once.

The update also improves navigation by:

• Displaying a “Showing X–Y of Z” indicator to clearly communicate the current range of results.
• Disabling the Prev and Next buttons when at the boundaries to prevent invalid navigation.
• Ensuring the pagination state is recalculated automatically when filtering results or changing the page size.

Changes:

• Removed the old page number dropdown (pageSelect) in favor of a Rows per page selector (pageSizeSelect).
• Added computeTotalPages() to handle dynamic page size changes and ensure valid navigation boundaries.
• Added renderShowingText() to show the visible range and total offers.
• Added updatePrevNextDisabledState() to handle disabling navigation buttons when appropriate.
• Updated HTML to reflect the new UI elements and labels.
• Maintained the default value to be 10 rows.

Pre-commit Checks:

• Ran pre-commit run --all-files locally with no issues found.

UI Design and Aesthetics:

• Matches the existing bootstrap-based styling and typography.
• Added small muted labels for “Rows per page” and “Showing…” text for better clarity without clutter.

Screenshots: