Initial commit: scaffold stack.gallery catalog frontend

ts_web/pages/index.ts

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+export * from './mainpage.js';

ts_web/pages/mainpage.ts

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+import { html } from '@design.estate/dees-element';
+
+export const mainpage = () => html`
+  <style>
+    body {
+      margin: 0;
+      padding: 0;
+      background: #111;
+    }
+    .demo-container {
+      min-height: 100vh;
+      display: flex;
+      align-items: center;
+      justify-content: center;
+      padding: 24px;
+    }
+    .demo-section {
+      background: #1a1a1a;
+      border: 1px solid #333;
+      padding: 48px;
+      max-width: 600px;
+      width: 100%;
+    }
+    h1 {
+      margin: 0 0 16px 0;
+      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
+      font-size: 28px;
+      color: #fff;
+    }
+    p {
+      margin: 0;
+      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
+      font-size: 16px;
+      color: #999;
+    }
+  </style>
+  <div class="demo-container">
+    <div class="demo-section">
+      <h1>Stack.Gallery Catalog</h1>
+      <p>Component catalog for the Stack.Gallery Registry UI. Use <code>tswatch</code> to start the development server.</p>
+    </div>
+  </div>
+`;