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/user-app-v2/index.html

@@ -1,7 +1,7 @@
 <!doctype html>
 <html lang="en">
   <head>
-    <link rel="icon" href="/favicon.ico" />
+    <link rel="icon" href="/favicon.ico?v=3" />
     <meta charset="UTF-8" />
     <meta name="apple-mobile-web-app-capable" content="yes" />
     <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent" />