Add HTML on-device UI preview for flasher catalog.

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

firmware/cyd_28r/media/preview.html

@@ -0,0 +1,79 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+<meta charset="utf-8" />
+<meta name="viewport" content="width=320" />
+<title>CLIMATE</title>
+<style>
+  *{box-sizing:border-box;margin:0;padding:0}
+  html,body{width:100%;height:100%;overflow:hidden;background:#000}
+  .bezel{width:100%;height:100%;display:grid;place-items:center;background:#1a1408}
+  .screen{
+    width:320px;height:240px;background:#0A1018;color:#F2F5FA;
+    font:12px/1.2 system-ui,sans-serif;position:relative;overflow:hidden;
+    transform-origin:center;transform:scale(var(--s,1));
+  }
+  .hdr{display:flex;align-items:center;gap:8px;padding:4px 8px;height:24px}
+  .hdr b{font-size:14px;font-weight:700}
+  .hdr .up{color:#7E90A8}
+  .hdr .sp{margin-left:auto;display:flex;align-items:center;gap:6px;color:#7E90A8}
+  .led{width:9px;height:9px;border-radius:50%;background:#4CAF7A}
+  .row{display:flex;gap:6px;padding:0 8px}
+  .panel{
+    flex:1;height:118px;background:#121C2A;border:1px solid #1E2C40;
+    border-radius:6px;padding:6px 8px;position:relative;
+  }
+  .cap{color:#7E90A8;font-size:11px}
+  .gauge{
+    width:90px;height:90px;margin:4px auto 0;border-radius:50%;
+    background:conic-gradient(#3DBF8C 0 70%, #243247 0);
+    mask:radial-gradient(farthest-side,transparent 62%,#000 63%);
+    -webkit-mask:radial-gradient(farthest-side,transparent 62%,#000 63%);
+  }
+  .panel.hum .gauge{background:conic-gradient(#3DB8A8 0 55%, #243247 0)}
+  .val{position:absolute;left:0;right:0;top:48px;text-align:center;font-size:24px;font-weight:700}
+  .panel.hum .val{color:#3DB8A8}
+  .panel.temp .val{color:#3DBF8C}
+  .unit{font-size:11px;color:#7E90A8;font-weight:500}
+  .rng{position:absolute;left:0;right:0;bottom:6px;text-align:center;color:#7E90A8;font-size:11px}
+  .bot{
+    margin:6px 8px 0;height:78px;background:#121C2A;border:1px solid #1E2C40;
+    border-radius:6px;display:flex;gap:8px;padding:8px;
+  }
+  .info{width:88px}
+  .ok{color:#E6B84D;font-size:14px;font-weight:700}
+  .bar{margin-top:8px;height:8px;background:#243247;border-radius:4px;overflow:hidden}
+  .bar>i{display:block;height:100%;width:62%;background:#E6B84D}
+  .meta{margin-top:10px;color:#7E90A8;font-size:11px}
+  .chart{flex:1;background:#0E1622;border-radius:4px;position:relative;overflow:hidden}
+  .chart svg{width:100%;height:100%}
+</style>
+</head>
+<body>
+<div class="bezel"><div class="screen" id="s">
+  <div class="hdr"><b>CLIMATE</b><span class="up">up 01:24</span>
+    <span class="sp"><span>OK</span><span class="led"></span></span></div>
+  <div class="row">
+    <div class="panel temp"><div class="cap">TEMP</div><div class="gauge"></div>
+      <div class="val">24.6<span class="unit">C</span></div><div class="rng">22.1 / 26.0</div></div>
+    <div class="panel hum"><div class="cap">HUM</div><div class="gauge"></div>
+      <div class="val">48<span class="unit">%</span></div><div class="rng">41 / 55</div></div>
+  </div>
+  <div class="bot">
+    <div class="info"><div class="ok">COMFORT</div><div class="bar"><i></i></div>
+      <div class="meta">DHT11 · GPIO22</div></div>
+    <div class="chart"><svg viewBox="0 0 180 60" preserveAspectRatio="none">
+      <polyline fill="none" stroke="#3DBF8C" stroke-width="2"
+        points="0,40 20,35 40,38 60,28 80,30 100,22 120,26 140,18 160,24 180,20"/>
+      <polyline fill="none" stroke="#3DB8A8" stroke-width="2"
+        points="0,45 20,42 40,44 60,40 80,38 100,36 120,39 140,34 160,37 180,35"/>
+    </svg></div>
+  </div>
+</div></div>
+<script>
+(function(){function fit(){var s=document.getElementById('s');var r=s.parentElement.getBoundingClientRect();
+var k=Math.min(r.width/320,r.height/240);s.style.setProperty('--s',k);}
+fit();addEventListener('resize',fit);})();
+</script>
+</body>
+</html>

firmware/cyd_28r/meta.json

@@ -0,0 +1,10 @@
+{
+  "boardId": "esp32-2432s028",
+  "name": "CYD climate dashboard",
+  "summary": "Temperature & humidity gauges with comfort bar and chart",
+  "description": "DHT11 on GPIO22. Dual arcs for TEMP/HUM, comfort status, live sparkline.",
+  "tags": ["climate", "dht11", "gauge"],
+  "media": {
+    "preview": "media/preview.html"
+  }
+}