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.

test/test.demoresolver.node.ts

@@ -0,0 +1,22 @@
+import { tap, expect } from '@git.zone/tstest/tapbundle';
+import { resolveTemplateFactory } from '../ts_web/elements/wcctools.helpers.js';
+import { html } from 'lit';
+
+const waitFor = (durationMs: number) => new Promise(resolve => setTimeout(resolve, durationMs));
+
+tap.test('resolveTemplateFactory returns sync TemplateResult', async () => {
+  const template = html`<p>sync demo</p>`;
+  const resolvedTemplate = await resolveTemplateFactory(() => template);
+  expect(resolvedTemplate).toEqual(template);
+});
+
+tap.test('resolveTemplateFactory awaits async TemplateResult', async () => {
+  const template = html`<p>async demo</p>`;
+  const resolvedTemplate = await resolveTemplateFactory(async () => {
+    await waitFor(5);
+    return template;
+  });
+  expect(resolvedTemplate).toEqual(template);
+});
+
+export default tap.start();