feat(showroom): Testseite mit Dummies, Schildern und Panel

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

animationen.html

@@ -0,0 +1,16 @@
+<!doctype html>
+<html lang="de">
+<head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Leonida · Animationen</title>
+    <style>
+        html, body { margin: 0; height: 100%; overflow: hidden; }
+        #container { width: 100%; height: 100%; }
+    </style>
+</head>
+<body>
+    <div id="container"></div>
+    <script type="module" src="/src/showroom/main.js"></script>
+</body>
+</html>