feat: add async demo support and enhance template resolution

- Introduced async demo functionality in the README, allowing for asynchronous data preparation before rendering components.
- Updated WccDashboard, WccProperties, and WccSidebar to support Promise-based template factories.
- Implemented resolveTemplateFactory to handle both synchronous and asynchronous template results.
- Added tests for resolveTemplateFactory to ensure correct behavior for both sync and async templates.
- Updated pnpm workspace configuration.

readme.md

@@ -211,6 +211,19 @@ export class MyComponent extends DeesElement {
 }
 ```
 
+### ⏳ Async Demos
+
+If your catalogue needs additional setup before rendering, return a `Promise` from the `demo` function. The dashboard waits for the result before inserting it into the viewport:
+
+```typescript
+public static demo = async () => {
+  await Promise.resolve(); // e.g. fetch data, load fixtures, or await wrappers
+  return html`<my-component .value=${'Loaded asynchronously'}></my-component>`;
+};
+```
+
+The same pattern works for page factories you pass into `setupWccTools`, enabling asynchronous data preparation across the entire demo surface.
+
 ### 🎭 Container Queries Support
 
 Components can respond to their container size:
@@ -389,4 +402,4 @@ Registered at District court Bremen HRB 35230 HB, Germany
 
 For any legal inquiries or if you require further information, please contact us via email at hello@task.vc.
 
-By using this repository, you acknowledge that you have read this section, agree to comply with its terms, and understand that the licensing of the code does not imply endorsement by Task Venture Capital GmbH of any derivative works.
+By using this repository, you acknowledge that you have read this section, agree to comply with its terms, and understand that the licensing of the code does not imply endorsement by Task Venture Capital GmbH of any derivative works.