feat: new Tehrani brand logo, custom button audience, trim dashboard

- Replace the crown logo with logo.svg / logo_bk.svg across both frontends;
  regenerate favicons and PWA icons via scripts/generate-brand-icons.cjs
- Custom button: admin chooses whether it shows before login or only after
- Dashboard: drop the survey-majority banner, hide the custom-order row

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

apps/admin-panel/index.html

@@ -3,8 +3,8 @@
   <head>
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <link rel="icon" type="image/png" href="/favicon.png?v=2" />
-    <link rel="shortcut icon" href="/favicon.ico?v=2" />
+    <link rel="icon" type="image/png" href="/favicon.png?v=3" />
+    <link rel="shortcut icon" href="/favicon.ico?v=3" />
     <title>%BRAND_TITLE%</title>
   </head>
   <body>