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/Operator.ts

@@ -0,0 +1,9 @@
+import { Subscriber } from './Subscriber';
+import { TeardownLogic } from './types';
+
+/***
+ * @deprecated Internal implementation detail, do not use directly. Will be made internal in v8.
+ */
+export interface Operator<T, R> {
+  call(subscriber: Subscriber<R>, source: any): TeardownLogic;
+}