Object layout ignored when entryLayout = `content`

[ExpensiveKoala]

Currently, achieving something like this is impossible:

(The address object field at the bottom right)

This is because when entryLayout is set to content, the span values are set to ${FIELD_GRID_COLUMNS} due to the container's width. https://github.com/Thinkmill/keystatic/blob/63c767bbb8b9bbc96c30535862bcccfbbc4ea346/packages/keystatic/src/form/fields/object/ui.tsx#L40-L42

When layout is specified, it should prioritize that value vs attempting to be responsive.