fix(@vben-core/layout-ui): stabilize internal layout scrolling

packages/@core/ui-kit/layout-ui/src/header-scroll-state.ts

@@ -0,0 +1,28 @@
+interface HeaderScrollStateOptions {
+  arrivedTop: boolean;
+  currentHidden: boolean;
+  directionDown: boolean;
+  directionUp: boolean;
+  headerHeight: number;
+  scrollTop: number;
+}
+
+export function resolveHeaderHiddenOnScroll({
+  arrivedTop,
+  currentHidden,
+  directionDown,
+  directionUp,
+  headerHeight,
+  scrollTop,
+}: HeaderScrollStateOptions) {
+  if (arrivedTop || scrollTop < headerHeight) {
+    return false;
+  }
+  if (directionUp) {
+    return false;
+  }
+  if (directionDown) {
+    return true;
+  }
+  return currentHidden;
+}