Performance: Calculate table footer totals on the server

[priethor]

What

Closes #132.

Table calculation footers now request the rows endpoint for totals when the table uses server pagination. The footer shows totals for the full filtered and searched result set, not just the current page, and still falls back to the existing local calculation path when server-side totals are unavailable.

Why

This avoids fetching every page just to calculate footer values locally, which made the default table calculation path heavier than necessary.

How

• Returning raw calculation values from the rows endpoint when callers request them.
• Reusing the existing footer formatting so server and local totals display the same way.
• Skipping row value hydration for plain count totals.

Testing Instructions

1. Open a collection table with enough rows to paginate.
2. Add a numeric table calculation, such as Sum, in the footer.
3. Apply a filter that still leaves more rows than the current page.
4. Move between pages and confirm the footer total stays the same.
5. Check that the total reflects all matching rows, not only the visible page.

Screen recording

Grabacion.de.pantalla.2026-06-26.a.las.17.06.17.mov