Size the source-priority skeleton to every metric line

The loading state now reserves one collapsed line per metric, the upper
bound of the loaded list, so the action row does not move down when the
ladders arrive.

src/components/settings/sources-section.tsx

@@ -727,8 +727,10 @@ function SourcesSkeletonList() {
         <Skeleton className="h-14 w-full rounded-md" />
         <Skeleton className="h-14 w-full rounded-md" />
       </div>
-      {[0, 1, 2, 3].map((i) => (
-        <Skeleton key={i} className="h-11 w-full rounded-md" />
+      {/* One collapsed line per remaining metric: the upper bound, so the
+          action row below never jumps down when the ladders arrive. */}
+      {SOURCE_PRIORITY_METRIC_KEYS.slice(1).map((metric) => (
+        <Skeleton key={metric} className="h-11 w-full rounded-md" />
       ))}
     </div>
   );