Fix gen-0 row wrapping when PoI has no spouses

Siblings sharing gen 0 with a spouse-less PoI now respect the
2-wide row limit instead of all rendering on a single line.

resources/js/modules/lib/layout/layout.js

@@ -112,8 +112,9 @@ export function computeLayout(persons, mainId, config) {
             continue;
         }
 
-        // Gen-0 (root + spouses): never wrap — all on one row
-        const rowLimit = (g === 0) ? ordered.length : 2;
+        // Gen-0 with spouses: never wrap — all on one row
+        // Gen-0 without spouses (siblings included): respect 2-wide limit
+        const rowLimit = (g === 0 && rootSpouses.size > 0) ? ordered.length : 2;
         const rows = wrapIntoRows(ordered, rowLimit);
 
         for (let r = 0; r < rows.length; r++) {