Add cydweb HTML UI preview for catalog cards.

Co-authored-by: Cursor <cursoragent@cursor.com>

firmware/cyd/media/preview.html

@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+<meta charset="utf-8" />
+<title>Active Buzzer</title>
+<style>
+
+  *{box-sizing:border-box;margin:0;padding:0}
+  html,body{width:320px;height:240px;overflow:hidden;background:#000;margin:0}
+  .bezel{width:320px;height:240px;background:#1a1408}
+  .screen{width:320px;height:240px;background:#0A1016;color:#EAF0F6;font:12px/1.2 system-ui,sans-serif;position:relative;overflow:hidden}
+  .muted{color:#7A8B9C}.ok{color:#3DDC97}.bad{color:#E85D4C}.acc{color:#4FC3F7}.amber{color:#FFB74D}
+  .btn{border:0;border-radius:8px;background:#243140;color:#EAF0F6;font-weight:600}
+  .btn.acc{background:#1A4A6E}.btn.on{background:#1B5E4A}.btn.warn{background:#6B3A1E}
+
+
+  .t{position:absolute;left:0;right:0;top:16px;text-align:center;font-size:26px;font-weight:700}
+  .pin{position:absolute;left:0;right:0;top:56px;text-align:center}
+  .st{position:absolute;left:0;right:0;top:88px;text-align:center;font-size:36px;font-weight:800}
+  .act{position:absolute;left:24px;right:24px;bottom:24px;height:64px;font-size:18px}
+
+</style>
+</head>
+<body>
+<div class="bezel"><div class="screen" id="s">
+
+  <div class="t">Active Buzzer</div>
+  <div class="pin muted">Signal -&gt; GPIO22</div>
+  <div class="st bad">OFF</div>
+  <button class="btn act" type="button">Turn ON</button>
+
+</div></div>
+</body>
+</html>

firmware/cyd/meta.json

@@ -3,5 +3,14 @@
   "name": "CYD Active Buzzer",
   "summary": "Active buzzer on GPIO22: tap on / tap off, default off",
   "description": "SoftSPI touch + LVGL. Signal->GPIO22 digital HIGH=on. Default off.",
-  "tags": ["buzzer", "active", "gpio22", "touch", "lvgl"]
+  "tags": [
+    "buzzer",
+    "active",
+    "gpio22",
+    "touch",
+    "lvgl"
+  ],
+  "media": {
+    "preview": "media/preview.html"
+  }
 }