docs: update workspace readme and finalize demo app configuration

Author: WanderleeDev

README.md

@@ -6,7 +6,7 @@ This is the workspace (monorepo) for the **ngx-theme-stack** project. It contain
 
 -   **`projects/ngx-theme-stack/`**: The Angular library source code.
 -   **`projects/ngx-theme-stack/schematics/`**: Angular CLI schematics to automate installation (`ng add`).
--   **`projects/demo-app/`** *(Upcoming)*: Example application for testing and demonstrating library features.
+-   **`projects/demo-ngx-theme-stack/`**: Official demonstration app showcasing Zero-Flash themes and signals.
 
 ## 🚀 Quick Commands
 

projects/demo-ngx-theme-stack/README.md

@@ -0,0 +1,31 @@
+# ngx-theme-stack Demo App 🚀
+
+This is the official demonstration application for the **ngx-theme-stack** library. It showcases:
+
+- **Critters Strategy**: Zero-flash theme application using inlined CSS variables.
+- **Utility Services**: Implementation of `ThemeToggleService`, `ThemeCycleService`, and `ThemeSelectService`.
+- **Dynamic Theming**: Support for `light`, `dark`, and a custom `sunset` theme.
+- **Signals-based UI**: Reactive interface that updates instantly on theme changes.
+
+## 🛠️ Development
+
+### Running the Demo
+From the root of the workspace:
+```bash
+pnpm start
+```
+Or specifically:
+```bash
+ng serve demo-ngx-theme-stack
+```
+
+### Syncing Configuration
+If you modify the themes in `appConfig`, run the sync command to refresh `index.html`:
+```bash
+pnpm prebuild
+```
+
+## 🏗️ Structure
+- `src/app/app.config.ts`: Library configuration.
+- `src/themes.css`: Theme tokens and variables.
+- `src/index.html`: Injected anti-flash script and critters trick.

projects/demo-ngx-theme-stack/public/banner.png

@@ -46,7 +46,7 @@
 
 
     <!-- ngx-theme-stack critters-trick -->
-    <div id="ngx-theme-stack-critters-trick" hidden>
+    <div id="ngx-theme-stack-critters-trick" hidden aria-hidden="true" style="display: none; overflow: hidden; clip-path: inset(50%); position: absolute;">
       <div class="light"></div>
       <div class="dark"></div>
       <div class="sunset"></div>