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.

ts_web/index.ts

@@ -1,7 +1,11 @@
 import { WccDashboard } from './elements/wcc-dashboard.js';
-import { LitElement, type TemplateResult } from 'lit';
+import { LitElement } from 'lit';
+import type { TTemplateFactory } from './elements/wcctools.helpers.js';
 
-const setupWccTools = (elementsArg?: { [key: string]: LitElement }, pagesArg?: { [key: string]: () => TemplateResult }) => {
+const setupWccTools = (
+  elementsArg?: { [key: string]: LitElement },
+  pagesArg?: Record<string, TTemplateFactory>
+) => {
   let hasRun = false;
   const runWccToolsSetup = async () => {
     if (document.readyState === 'complete' && !hasRun) {