fix(page-permission): make people-with-access list scroll past 4 entries (#2137)

The "People with access" list in the page share modal used
<ScrollArea mah={250}>, which caps the container height but does not
make the inner viewport scroll (no fixed height is given to the
viewport). Items beyond ~4 entries were rendered correctly but clipped
out of view.

Switches to <ScrollArea.Autosize mah={400}>, which is Mantine's
dedicated primitive for "grow with content up to a max, then scroll".

Closes #2135

apps/client/src/ee/page-permission/components/page-permission-list.tsx

@@ -140,7 +140,7 @@ export function PagePermissionList({
         )}
       </Group>
 
-      <ScrollArea mah={250} viewportRef={viewportRef}>
+      <ScrollArea.Autosize mah={400} viewportRef={viewportRef}>
         {sortedMembers.map((member) => (
           <PagePermissionItem
             key={`${member.type}-${member.id}`}
@@ -158,7 +158,7 @@ export function PagePermissionList({
             <Loader size="xs" />
           </Center>
         )}
-      </ScrollArea>
+      </ScrollArea.Autosize>
     </>
   );
 }