Add comprehensive library expansion with new components and demos

- Add new libraries: ui-accessibility, ui-animations, ui-backgrounds, ui-code-display, ui-data-utils, ui-font-manager, hcl-studio
- Add extensive layout components: gallery-grid, infinite-scroll-container, kanban-board, masonry, split-view, sticky-layout
- Add comprehensive demo components for all new features
- Update project configuration and dependencies
- Expand component exports and routing structure
- Add UI landing pages planning document

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

projects/ui-code-display/node_modules/rxjs/src/internal/scheduler/QueueAction.ts

@@ -0,0 +1,44 @@
+import { AsyncAction } from './AsyncAction';
+import { Subscription } from '../Subscription';
+import { QueueScheduler } from './QueueScheduler';
+import { SchedulerAction } from '../types';
+import { TimerHandle } from './timerHandle';
+
+export class QueueAction<T> extends AsyncAction<T> {
+  constructor(protected scheduler: QueueScheduler, protected work: (this: SchedulerAction<T>, state?: T) => void) {
+    super(scheduler, work);
+  }
+
+  public schedule(state?: T, delay: number = 0): Subscription {
+    if (delay > 0) {
+      return super.schedule(state, delay);
+    }
+    this.delay = delay;
+    this.state = state;
+    this.scheduler.flush(this);
+    return this;
+  }
+
+  public execute(state: T, delay: number): any {
+    return delay > 0 || this.closed ? super.execute(state, delay) : this._execute(state, delay);
+  }
+
+  protected requestAsyncId(scheduler: QueueScheduler, id?: TimerHandle, delay: number = 0): TimerHandle {
+    // If delay exists and is greater than 0, or if the delay is null (the
+    // action wasn't rescheduled) but was originally scheduled as an async
+    // action, then recycle as an async action.
+
+    if ((delay != null && delay > 0) || (delay == null && this.delay > 0)) {
+      return super.requestAsyncId(scheduler, id, delay);
+    }
+
+    // Otherwise flush the scheduler starting with this action.
+    scheduler.flush(this);
+
+    // HACK: In the past, this was returning `void`. However, `void` isn't a valid
+    // `TimerHandle`, and generally the return value here isn't really used. So the
+    // compromise is to return `0` which is both "falsy" and a valid `TimerHandle`,
+    // as opposed to refactoring every other instanceo of `requestAsyncId`.
+    return 0;
+  }
+}