feat(web): set the page favicon (logo.svg)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

index.html

@@ -4,6 +4,7 @@
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>Open CAD Studio</title>
+    <link data-trunk rel="icon" href="assets/logo.svg" />
     <style>
       html, body { margin: 0; padding: 0; width: 100%; height: 100%; overflow: hidden; background: #1e1e1e; }
       canvas { display: block; }