fix(ui): read paging snapshot directly

Replace the per-index peek loop with the item snapshot list;
the loop walked the whole result set on every recomposition.

app/src/main/java/com/example/research/ui/main/SearchResultsPane.kt

@@ -80,13 +80,7 @@ internal fun SearchResultsPane(
             }
     }
 
-    val loaded = ArrayList<IndexEntry>(results.itemCount)
-    for (index in 0 until results.itemCount) {
-        val entry = results.peek(index)
-        if (entry != null) {
-            loaded.add(entry)
-        }
-    }
+    val loaded = results.itemSnapshotList.items.filterNotNull()
     SideEffect {
         if (results.loadState.refresh is LoadState.NotLoading && loaded.isNotEmpty()) {
             staleEntries = loaded