Add comprehensive toast notification component to feedback category

- Create new toast component with full TypeScript implementation
- Add SCSS styling using semantic design tokens exclusively
- Implement size variants (sm, md, lg) and color variants (primary, success, warning, danger, info)
- Include interactive features: auto-dismiss, manual dismiss, progress bar, hover pause/resume
- Add comprehensive accessibility support with ARIA attributes and keyboard navigation
- Create engaging demo component with interactive examples and live statistics
- Integrate toast into feedback category menu and routing system
- Follow established component patterns and design system conventions

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

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

projects/demo-ui-essentials/src/app/demos/demos.routes.ts

@@ -43,6 +43,12 @@ import { ProgressCircleDemoComponent } from './progress-circle-demo/progress-cir
 import { RangeSliderDemoComponent } from './range-slider-demo/range-slider-demo.component';
 import { DividerDemoComponent } from './divider-demo/divider-demo.component';
 import { TooltipDemoComponent } from './tooltip-demo/tooltip-demo.component';
+import { AccordionDemoComponent } from './accordion-demo/accordion-demo.component';
+import { PopoverDemoComponent } from './popover-demo/popover-demo.component';
+import { AlertDemoComponent } from './alert-demo/alert-demo.component';
+import { ToastDemoComponent } from './toast-demo/toast-demo.component';
+import { TreeViewDemoComponent } from './tree-view-demo/tree-view-demo.component';
+import { TimelineDemoComponent } from './timeline-demo/timeline-demo.component';
 
 
 @Component({
@@ -213,6 +219,30 @@ import { TooltipDemoComponent } from './tooltip-demo/tooltip-demo.component';
                 <ui-tooltip-demo></ui-tooltip-demo>
 			}
 
+			@case ("accordion") {
+                <ui-accordion-demo></ui-accordion-demo>
+			}
+
+			@case ("popover") {
+                <ui-popover-demo></ui-popover-demo>
+			}
+
+			@case ("alert") {
+                <ui-alert-demo></ui-alert-demo>
+			}
+
+			@case ("toast") {
+                <ui-toast-demo></ui-toast-demo>
+			}
+
+			@case ("tree-view") {
+                <ui-tree-view-demo></ui-tree-view-demo>
+			}
+
+			@case ("timeline") {
+                <ui-timeline-demo></ui-timeline-demo>
+			}
+
             
 		}
 	`,
@@ -227,7 +257,8 @@ import { TooltipDemoComponent } from './tooltip-demo/tooltip-demo.component';
     GridSystemDemoComponent, SpacerDemoComponent, ContainerDemoComponent, PaginationDemoComponent,
     SkeletonLoaderDemoComponent, EmptyStateDemoComponent, FileUploadDemoComponent, FormFieldDemoComponent,
     AutocompleteDemoComponent, BackdropDemoComponent, OverlayContainerDemoComponent, LoadingSpinnerDemoComponent,
-    ProgressCircleDemoComponent, RangeSliderDemoComponent, DividerDemoComponent, TooltipDemoComponent]
+    ProgressCircleDemoComponent, RangeSliderDemoComponent, DividerDemoComponent, TooltipDemoComponent, AccordionDemoComponent,
+    PopoverDemoComponent, AlertDemoComponent, ToastDemoComponent, TreeViewDemoComponent, TimelineDemoComponent]
 })